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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
<meta name="theme-color" content="#222"><meta name="generator" content="Hexo 5.4.2">
<link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png">
<link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32-next.png">
<link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png">
<link rel="mask-icon" href="/images/logo.svg" color="#222">
<link rel="stylesheet" href="/css/main.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.2.1/css/all.min.css" integrity="sha256-Z1K5uhUaJXA7Ll0XrZ/0JhX4lAtZFpT6jkKrEDT0drU=" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.1.1/animate.min.css" integrity="sha256-PR7ttpcvz8qrF57fur/yAx1qXMFJeJFiA6pSzWi0OIE=" crossorigin="anonymous">
<script class="next-config" data-name="main" type="application/json">{"hostname":"example.com","root":"/","images":"/images","scheme":"Muse","darkmode":false,"version":"8.14.2","exturl":false,"sidebar":{"position":"left","display":"post","padding":18,"offset":12},"copycode":{"enable":false,"style":null},"bookmark":{"enable":false,"color":"#222","save":"auto"},"mediumzoom":false,"lazyload":false,"pangu":false,"comments":{"style":"tabs","active":null,"storage":true,"lazyload":false,"nav":null},"stickytabs":false,"motion":{"enable":true,"async":false,"transition":{"menu_item":"fadeInDown","post_block":"fadeIn","post_header":"fadeInDown","post_body":"fadeInDown","coll_header":"fadeInLeft","sidebar":"fadeInUp"}},"prism":false,"i18n":{"placeholder":"Searching...","empty":"We didn't find any results for the search: ${query}","hits_time":"${hits} results found in ${time} ms","hits":"${hits} results found"}}</script><script src="/js/config.js"></script>
<meta property="og:type" content="website">
<meta property="og:title" content="menger's blog">
<meta property="og:url" content="http://example.com/index.html">
<meta property="og:site_name" content="menger's blog">
<meta property="og:locale" content="en_US">
<meta property="article:author" content="meng-er">
<meta name="twitter:card" content="summary">
<link rel="canonical" href="http://example.com/">
<script class="next-config" data-name="page" type="application/json">{"sidebar":"","isHome":true,"isPost":false,"lang":"en","comments":"","permalink":"","path":"index.html","title":""}</script>
<script class="next-config" data-name="calendar" type="application/json">""</script>
<title>menger's blog</title>
<noscript>
<link rel="stylesheet" href="/css/noscript.css">
</noscript>
</head>
<body itemscope itemtype="http://schema.org/WebPage" class="use-motion">
<div class="headband"></div>
<main class="main">
<div class="column">
<header class="header" itemscope itemtype="http://schema.org/WPHeader"><div class="site-brand-container">
<div class="site-nav-toggle">
<div class="toggle" aria-label="Toggle navigation bar" role="button">
</div>
</div>
<div class="site-meta">
<a href="/" class="brand" rel="start">
<i class="logo-line"></i>
<h1 class="site-title">menger's blog</h1>
<i class="logo-line"></i>
</a>
</div>
<div class="site-nav-right">
<div class="toggle popup-trigger" aria-label="Search" role="button">
</div>
</div>
</div>
</header>
<aside class="sidebar">
<div class="sidebar-inner sidebar-overview-active">
<ul class="sidebar-nav">
<li class="sidebar-nav-toc">
Table of Contents
</li>
<li class="sidebar-nav-overview">
Overview
</li>
</ul>
<div class="sidebar-panel-container">
<!--noindex-->
<div class="post-toc-wrap sidebar-panel">
</div>
<!--/noindex-->
<div class="site-overview-wrap sidebar-panel">
<div class="site-author animated" itemprop="author" itemscope itemtype="http://schema.org/Person">
<p class="site-author-name" itemprop="name">meng-er</p>
<div class="site-description" itemprop="description"></div>
</div>
<div class="site-state-wrap animated">
<nav class="site-state">
<div class="site-state-item site-state-posts">
<a href="/archives/">
<span class="site-state-item-count">8</span>
<span class="site-state-item-name">posts</span>
</a>
</div>
<div class="site-state-item site-state-tags">
<span class="site-state-item-count">2</span>
<span class="site-state-item-name">tags</span>
</div>
</nav>
</div>
</div>
</div>
</div>
</aside>
</div>
<div class="main-inner index posts-expand">
<div class="post-block">
<article itemscope itemtype="http://schema.org/Article" class="post-content" lang="">
<link itemprop="mainEntityOfPage" href="http://example.com/2023/02/02/hello-world/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.gif">
<meta itemprop="name" content="meng-er">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="menger's blog">
<meta itemprop="description" content="">
</span>
<span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork">
<meta itemprop="name" content="undefined | menger's blog">
<meta itemprop="description" content="">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2023/02/02/hello-world/" class="post-title-link" itemprop="url">Hello World</a>
</h2>
<div class="post-meta-container">
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">Posted on</span>
<time title="Created: 2023-02-02 18:32:54" itemprop="dateCreated datePublished" datetime="2023-02-02T18:32:54+08:00">2023-02-02</time>
</span>
</div>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<p>Welcome to <a target="_blank" rel="noopener" href="https://hexo.io/">Hexo</a>! This is your very first post. Check <a target="_blank" rel="noopener" href="https://hexo.io/docs/">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a target="_blank" rel="noopener" href="https://hexo.io/docs/troubleshooting.html">troubleshooting</a> or you can ask me on <a target="_blank" rel="noopener" href="https://github.com/hexojs/hexo/issues">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/writing.html">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/server.html">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/generating.html">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/one-command-deployment.html">Deployment</a></p>
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</article>
</div>
<div class="post-block">
<article itemscope itemtype="http://schema.org/Article" class="post-content" lang="">
<link itemprop="mainEntityOfPage" href="http://example.com/2023/02/01/vue3-axios%E5%AE%9E%E7%8E%B0%E5%89%8D%E5%90%8E%E7%AB%AF%E6%95%B0%E6%8D%AE%E4%BC%A0%E8%BE%93/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="image" content="/images/avatar.gif">
<meta itemprop="name" content="meng-er">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="menger's blog">
<meta itemprop="description" content="">
</span>
<span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork">
<meta itemprop="name" content="undefined | menger's blog">
<meta itemprop="description" content="">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a href="/2023/02/01/vue3-axios%E5%AE%9E%E7%8E%B0%E5%89%8D%E5%90%8E%E7%AB%AF%E6%95%B0%E6%8D%AE%E4%BC%A0%E8%BE%93/" class="post-title-link" itemprop="url">vue3+axios实现前后端数据传输</a>
</h2>
<div class="post-meta-container">
<div class="post-meta">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="far fa-calendar"></i>
</span>
<span class="post-meta-item-text">Posted on</span>
<time title="Created: 2023-02-01 17:38:46 / Modified: 18:42:13" itemprop="dateCreated datePublished" datetime="2023-02-01T17:38:46+08:00">2023-02-01</time>
</span>
</div>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<p><strong>版本说明</strong></p>
<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">"vue"</span><span class="punctuation">:</span> <span class="string">"^3.2.45"</span><span class="punctuation">,</span></span><br><span class="line"><span class="attr">"vue-router"</span><span class="punctuation">:</span> <span class="string">"^4.1.6"</span><span class="punctuation">,</span></span><br><span class="line"><span class="attr">"vite"</span><span class="punctuation">:</span> <span class="string">"^4.0.0"</span></span><br></pre></td></tr></table></figure>
<ul>
<li><h1 id="step1-设置跨域"><a href="#step1-设置跨域" class="headerlink" title="step1.设置跨域"></a>step1.设置跨域</h1></li>
</ul>
<p>在项目的根目录下新建<code>vite.config.ts</code>，写入如下代码</p>
<p>⚠️后缀名不是js、文件名也不是vue.config，vue.config.js是vue2的东西。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> { defineConfig } <span class="keyword">from</span> <span class="string">'vite'</span></span><br><span class="line"><span class="keyword">import</span> vue <span class="keyword">from</span> <span class="string">'@vitejs/plugin-vue'</span></span><br><span class="line"><span class="keyword">import</span> vueJsx <span class="keyword">from</span> <span class="string">'@vitejs/plugin-vue-jsx'</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="title function_">defineConfig</span>({</span><br><span class="line"> <span class="attr">plugins</span>: [<span class="title function_">vue</span>(), <span class="title function_">vueJsx</span>()],</span><br><span class="line"> <span class="attr">server</span>: {</span><br><span class="line"> <span class="attr">open</span>: <span class="literal">true</span>, <span class="comment">//自动打开</span></span><br><span class="line"> <span class="attr">base</span>: <span class="string">"./ "</span>, <span class="comment">//生产环境路径</span></span><br><span class="line"> <span class="attr">proxy</span>: { </span><br><span class="line"> <span class="string">'^/api'</span>: {</span><br><span class="line"> <span class="attr">target</span>: <span class="string">'http://localhost:8080/'</span>, <span class="comment">// 后端服务实际地址</span></span><br><span class="line"> <span class="attr">changeOrigin</span>: <span class="literal">true</span>, <span class="comment">//开启代理</span></span><br><span class="line"> <span class="attr">rewrite</span>: <span class="function">(<span class="params">path</span>) =></span> path.<span class="title function_">replace</span>(<span class="regexp">/^\/api/</span>, <span class="string">''</span>)</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<p>再逼逼赖赖两句：跨域是啥？为什么要跨域？</p>
<ul>
<li><h1 id="step2-把发送请求写到一个文件中"><a href="#step2-把发送请求写到一个文件中" class="headerlink" title="step2.把发送请求写到一个文件中"></a>step2.把发送请求写到一个文件中</h1></li>
</ul>
<p>为了方便维护，把所有请求写在一个文件中。</p>
<p>新建<code>project/src/api/user.ts</code></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> <span class="title class_">Axios</span> <span class="keyword">from</span> <span class="string">'axios'</span></span><br><span class="line"><span class="keyword">const</span> base = <span class="string">'http://localhost:5173/api'</span><span class="comment">//这个api随便替换成想要的名字，主要是从5173分一部分出去给服务器</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> <span class="title function_">Login</span> = (<span class="params">data: { [key: string]: any }</span>) => {</span><br><span class="line"> <span class="comment">//data是get请求的参数</span></span><br><span class="line"> <span class="keyword">return</span> <span class="title class_">Axios</span>.<span class="title function_">get</span>(base + <span class="string">'/login'</span>, { <span class="string">'params'</span>: data })</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> {</span><br><span class="line"> <span class="comment">//暴露出去，vue视图那边要用</span></span><br><span class="line"> base,</span><br><span class="line"> <span class="title class_">Login</span></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li><h1 id="step3-在vue视图层引用"><a href="#step3-在vue视图层引用" class="headerlink" title="step3.在vue视图层引用"></a>step3.在vue视图层引用</h1></li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> <span class="title function_">submitForm</span> = (<span class="params">formEl: FormInstance | <span class="literal">undefined</span></span>) => {</span><br><span class="line"> <span class="keyword">if</span> (!formEl) <span class="keyword">return</span></span><br><span class="line"> formEl.<span class="title function_">validate</span>(<span class="function">(<span class="params">valid</span>) =></span> {</span><br><span class="line"> <span class="keyword">if</span> (valid) {</span><br><span class="line"> <span class="comment">//🦦看这里看这里！是这在用</span></span><br><span class="line"> <span class="title class_">User</span>.<span class="title class_">Login</span>(</span><br><span class="line"> { <span class="attr">tel</span>: <span class="string">"13388110101"</span>, <span class="attr">password</span>: <span class="string">"123"</span> }</span><br><span class="line"> ).<span class="title function_">then</span>(<span class="function"><span class="params">res</span> =></span> {</span><br><span class="line"> <span class="comment">//把后端返回的数据打印下来</span></span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">'login response data'</span>, res)</span><br><span class="line"> })</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">'error submit!'</span>)</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">false</span></span><br><span class="line"> }</span><br><span class="line"> })</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h1 id="后记"><a href="#后记" class="headerlink" title="后记"></a>后记</h1><p>当然，用get方法传输账号密码肯定是非常不科学的。不过这里的重点是跨域和发送请求、接收请求，就先浅浅忽视掉这个问题。</p>
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<p>之前从没遇见过，element的输入框用不了了。</p>
<ul>
<li><strong>版本说明</strong></li>
</ul>
<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">"vue"</span><span class="punctuation">:</span> <span class="string">"^3.2.45"</span><span class="punctuation">,</span></span><br><span class="line"><span class="attr">"element-plus"</span><span class="punctuation">:</span> <span class="string">"2.2.28"</span></span><br></pre></td></tr></table></figure>
<p>错误代码：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><template></span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">el-form</span> <span class="attr">ref</span>=<span class="string">"ruleFormRef"</span> <span class="attr">:model</span>=<span class="string">"ruleForm"</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">el-form-item</span> <span class="attr">v-model</span>=<span class="string">"ruleForm.tel"</span> <span class="attr">label</span>=<span class="string">"tel"</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">el-input</span> /></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">el-form-item</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">el-form-item</span> <span class="attr">v-model</span>=<span class="string">"ruleForm.psw"</span> <span class="attr">label</span>=<span class="string">"password"</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">el-input</span> /></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">el-form-item</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">el-form</span>></span></span></span><br><span class="line"></template></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">lang</span>=<span class="string">"ts"</span> <span class="attr">setup</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> { reactive } <span class="keyword">from</span> <span class="string">'vue'</span></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> ruleForm = <span class="title function_">reactive</span>({</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">tel</span>: <span class="string">'133'</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">psw</span>: <span class="string">''</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">})</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ul>
<li><h1 id="A1-强制刷新"><a href="#A1-强制刷新" class="headerlink" title="A1:强制刷新"></a><strong>A1:强制刷新</strong></h1></li>
</ul>
<p>也是网上最主流的解决方法：在input组件中加一个强制刷新<code>@input="$forceUpdate()"</code></p>
<p>原理是：其实已经输入成功，只是视图层还没刷新。</p>
<p>我试了一下不行，于是在浏览器中打印了表单，发现还是js部分设置的原始ruleform</p>
<p></p>
<p>说明不是视图层没有刷新的问题</p>
<ul>
<li><h1 id="A2-没有设置v-model"><a href="#A2-没有设置v-model" class="headerlink" title="A2:没有设置v-model"></a><strong>A2:没有设置v-model</strong></h1></li>
</ul>
<p>网上说是没有设置v-modle 检查了一下都设置了呀</p>
<ul>
<li><h1 id="A3-v-model设置位置错误"><a href="#A3-v-model设置位置错误" class="headerlink" title="A3:v-model设置位置错误"></a><strong>A3:v-model设置位置错误</strong></h1></li>
</ul>
<p>是从这篇文章里找到的</p>
<p><a target="_blank" rel="noopener" href="https://blog.csdn.net/weixin_45883730/article/details/108779686">https://blog.csdn.net/weixin_45883730/article/details/108779686</a></p>
<p></p>
<p>作者顺嘴提了一句，v-modle不要设置错了位置，检查一下竟是我本人。。感恩的心。。</p>
<p>ps.这篇也是网上解决该问题方案比较全的文章，推荐阅读</p>
<p>最后附正确代码</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><template></span><br><span class="line"> <span class="language-xml"><span class="tag"><<span class="name">el-form</span> <span class="attr">ref</span>=<span class="string">"ruleFormRef"</span> <span class="attr">:model</span>=<span class="string">"ruleForm"</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">el-form-item</span> <span class="attr">label</span>=<span class="string">"tel"</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">el-input</span> <span class="attr">v-model</span>=<span class="string">"ruleForm.tel"</span> /></span>//改了这里</span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">el-form-item</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">el-form-item</span> <span class="attr">label</span>=<span class="string">"password"</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"><<span class="name">el-input</span> <span class="attr">v-model</span>=<span class="string">"ruleForm.psw"</span> /></span>//改了这里</span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">el-form-item</span>></span></span></span><br><span class="line"><span class="language-xml"> <span class="tag"></<span class="name">el-form</span>></span></span></span><br><span class="line"></template></span><br><span class="line"></span><br><span class="line"><span class="language-xml"><span class="tag"><<span class="name">script</span> <span class="attr">lang</span>=<span class="string">"ts"</span> <span class="attr">setup</span>></span><span class="language-javascript"></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">import</span> { reactive } <span class="keyword">from</span> <span class="string">'vue'</span></span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"><span class="keyword">const</span> ruleForm = <span class="title function_">reactive</span>({</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">tel</span>: <span class="string">'133'</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"> <span class="attr">psw</span>: <span class="string">''</span>,</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml">})</span></span></span><br><span class="line"><span class="language-javascript"><span class="language-xml"></span><span class="tag"></<span class="name">script</span>></span></span></span><br></pre></td></tr></table></figure>
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<p>版本说明</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">% node -v</span><br><span class="line">v18.13.0</span><br></pre></td></tr></table></figure>
<h1 id="前端"><a href="#前端" class="headerlink" title="前端"></a>前端</h1><ul>
<li><h2 id="版本说明"><a href="#版本说明" class="headerlink" title="版本说明"></a><strong>版本说明</strong></h2></li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">% npm axios -v</span><br><span class="line">8.19.3</span><br></pre></td></tr></table></figure>
<ul>
<li><h2 id="基本思路"><a href="#基本思路" class="headerlink" title="基本思路"></a><strong>基本思路</strong></h2></li>
</ul>
<p>生成buffer、获取文件名</p>
<p>将buffer对象和文件名发送至后端</p>
<ul>
<li><h2 id="附代码"><a href="#附代码" class="headerlink" title="附代码"></a><strong>附代码</strong></h2></li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> axios = <span class="built_in">require</span>(<span class="string">'axios'</span>)</span><br><span class="line"><span class="keyword">const</span> fs = <span class="built_in">require</span>(<span class="string">'fs'</span>)<span class="comment">//node的file system，核心模块无需下载</span></span><br><span class="line"><span class="keyword">const</span> path = <span class="built_in">require</span>(<span class="string">'path'</span>);<span class="comment">//核心模块无需下载</span></span><br><span class="line"><span class="keyword">const</span> file_name = path.<span class="title function_">basename</span>(<span class="string">'../pic/test.jpg'</span>);<span class="comment">//获取文件名，替换成自己的路径</span></span><br><span class="line"><span class="keyword">let</span> bitmap = fs.<span class="title function_">readFileSync</span>(<span class="string">'../pic/test.jpg'</span>);<span class="comment">//获取buffer，替换成自己的路径</span></span><br><span class="line"></span><br><span class="line">axios.<span class="title function_">post</span>(<span class="string">'http://localhost:8080/file'</span>, {</span><br><span class="line"> <span class="string">'file_name'</span>: file_name,</span><br><span class="line"> <span class="string">'bitmap'</span>: bitmap</span><br><span class="line">})</span><br><span class="line"> .<span class="title function_">then</span>(<span class="keyword">function</span> (<span class="params">response</span>) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(response);</span><br><span class="line"> })</span><br><span class="line"> .<span class="title function_">catch</span>(<span class="keyword">function</span> (<span class="params">error</span>) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(error);</span><br><span class="line"> });</span><br></pre></td></tr></table></figure>
<h1 id="后端"><a href="#后端" class="headerlink" title="后端"></a>后端</h1><ul>
<li><h2 id="版本说明-1"><a href="#版本说明-1" class="headerlink" title="版本说明"></a><strong>版本说明</strong></h2></li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">% express --version</span><br><span class="line">4.16.1</span><br></pre></td></tr></table></figure>
<ul>
<li><h2 id="Q1：取不到前端请求的参数-gt-A：body-parser的使用"><a href="#Q1：取不到前端请求的参数-gt-A：body-parser的使用" class="headerlink" title="Q1：取不到前端请求的参数->A：body-parser的使用"></a><strong>Q1</strong>：<strong>取不到前端请求的参数->A：body-parser的使用</strong></h2></li>
</ul>
<p>首次在后端console.log(req)，找不到前端发送过来的参数。</p>
<p>查看<a target="_blank" rel="noopener" href="https://expressjs.com/en/4x/api.html">express文档</a>后发现取到post方法的参数需要使用中间件。</p>
<p>express内置了express.json([options])（仅支持v4.16.0 以上），用来解析json格式的请求。同时该中间件是基于node提供的body-parser中间件，所以最后选择使用<a target="_blank" rel="noopener" href="https://github.com/expressjs/body-parser">body-parser</a>。</p>
<p>安装</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ npm install body-parser</span><br></pre></td></tr></table></figure>
<p>引入</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> bodyParser = <span class="built_in">require</span>(<span class="string">'body-parser'</span>)</span><br></pre></td></tr></table></figure>
<p>这个模块一共提供了四个解析器</p>
<ul>
<li>JSON body parser</li>
<li>Raw body parser</li>
<li>Text body parser</li>
<li>URL-encoded form body parser</li>
</ul>
<p>猜测这里只需要用到json的解析器</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> jsonParser = bodyParser.<span class="title function_">json</span>({})</span><br><span class="line">app.<span class="title function_">use</span>(jsonParser)</span><br></pre></td></tr></table></figure>
<p>哦豁报错了，说req太大了</p>
<p><code>PayloadTooLargeError: request entity too large</code></p>
<p>于是修改了一下前端，post了几个字符串过来，哎你猜怎么着，后端取到啦</p>
<p>看来取参应该是没问题了，传不过来是文件太大的问题</p>
<ul>
<li><h2 id="Q2-PayloadTooLargeError-request-entity-too-large-gt-A：提高limit"><a href="#Q2-PayloadTooLargeError-request-entity-too-large-gt-A：提高limit" class="headerlink" title="Q2:PayloadTooLargeError: request entity too large->A：提高limit"></a><strong>Q2:<code>PayloadTooLargeError: request entity too large</code>->A：提高limit</strong></h2></li>
</ul>
<p>关于传输大小的问题，body-parser的文档里有提到，如果有需要在body-parser.json({option})里修改选项</p>
<p>原文：</p>
<blockquote>
<h5 id="limit"><a href="#limit" class="headerlink" title="limit"></a>limit</h5><p>Controls the maximum request body size. If this is a number, then the value specifies the number of bytes; if it is a string, the value is passed to the <a target="_blank" rel="noopener" href="https://www.npmjs.com/package/bytes">bytes</a> library for parsing. Defaults to <code>'100kb'</code>.</p>
</blockquote>
<p>更改一下</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> jsonParser = bodyParser.<span class="title function_">json</span>({</span><br><span class="line"> <span class="attr">limit</span>: <span class="string">'50mb'</span></span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<p>后端取到前端发来的bitmap啦</p>
<p>接着用fs的writeFile方法写入文件，又出现了新的报错</p>
<p><code>TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of Array</code></p>
<ul>
<li><h2 id="Q3-fs-writeFile-只接收字符串或buffer对象-gt-A-把数组转换为buffer对象"><a href="#Q3-fs-writeFile-只接收字符串或buffer对象-gt-A-把数组转换为buffer对象" class="headerlink" title="Q3:fs.writeFile()只接收字符串或buffer对象->A:把数组转换为buffer对象"></a><strong>Q3:fs.writeFile()只接收字符串或buffer对象->A:把数组转换为buffer对象</strong></h2><p>先贴一下错误代码</p>
</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//我是错误代码</span></span><br><span class="line">app.<span class="title function_">post</span>(<span class="string">'/file'</span>, <span class="keyword">function</span> (<span class="params">req, res</span>) {</span><br><span class="line"> <span class="keyword">var</span> data = req.<span class="property">body</span>.<span class="property">bitmap</span>.<span class="property">data</span></span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(data)</span><br><span class="line"> fs.<span class="title function_">writeFile</span>(path, data, <span class="keyword">function</span> (<span class="params">err</span>) {</span><br><span class="line"> <span class="comment">//第一个参数是文件写入的路径</span></span><br><span class="line"> <span class="keyword">if</span> (!err) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"文件写入成功"</span>);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(err)</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
<p>其中<code>data</code>打出来长这样：明显是个数组。报错也说的很明白了，转成buffer对象就行</p>
<p><code>var data = Buffer.from(req.body.bitmap.data)</code></p>
<p>指定路径收到了前端发来的文件，大成功！</p>
<ul>
<li><h2 id="附全部代码"><a href="#附全部代码" class="headerlink" title="附全部代码"></a><strong>附全部代码</strong></h2></li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> express = <span class="built_in">require</span>(<span class="string">"express"</span>);</span><br><span class="line"><span class="keyword">const</span> app = <span class="title function_">express</span>();</span><br><span class="line"><span class="keyword">var</span> bodyParser = <span class="built_in">require</span>(<span class="string">'body-parser'</span>)<span class="comment">//中间件</span></span><br><span class="line"><span class="keyword">let</span> fs = <span class="built_in">require</span>(<span class="string">'fs'</span>)</span><br><span class="line"><span class="keyword">var</span> path = <span class="string">"../pic"</span>;<span class="comment">//要写入到哪里去，修改成自己的路径</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> jsonParser = bodyParser.<span class="title function_">json</span>({</span><br><span class="line"> <span class="attr">limit</span>: <span class="string">'50mb'</span></span><br><span class="line">})</span><br><span class="line">app.<span class="title function_">use</span>(jsonParser)</span><br><span class="line"></span><br><span class="line">app.<span class="title function_">post</span>(<span class="string">'/file'</span>, <span class="keyword">function</span> (<span class="params">req, res</span>) {</span><br><span class="line"> <span class="keyword">var</span> data = <span class="title class_">Buffer</span>.<span class="title function_">from</span>(req.<span class="property">body</span>.<span class="property">bitmap</span>.<span class="property">data</span>)</span><br><span class="line"> fs.<span class="title function_">writeFile</span>(path + <span class="string">'/'</span> + req.<span class="property">body</span>.<span class="property">file_name</span>, data, <span class="keyword">function</span> (<span class="params">err</span>) {</span><br><span class="line"> <span class="keyword">if</span> (!err) {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"文件写入成功"</span>);</span><br><span class="line"> res.<span class="title function_">send</span>({ <span class="string">'msg'</span>: <span class="string">"写入成功"</span>, <span class="string">'code'</span>: <span class="number">1</span>, <span class="string">'path'</span>: path + <span class="string">'/'</span> + req.<span class="property">body</span>.<span class="property">file_name</span>, data })</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(err)</span><br><span class="line"> }</span><br><span class="line"> });</span><br><span class="line">})</span><br><span class="line">app.<span class="title function_">listen</span>(<span class="number">8080</span>, <span class="function">() =></span> {</span><br><span class="line"> <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">"server start"</span>)</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
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<p>新建一个文件夹，进入该文件夹中，运行</p>
<p>文件夹命名：英文、不能有空格</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">npm init -y//生成package.json</span><br><span class="line">npm install//生成package-lock.json</span><br></pre></td></tr></table></figure>
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<li>登陆</li>
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<p><code>mysql -u root -p;</code></p>
<p>密码gymA20000925</p>
<ul>
<li>查看数据库</li>
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<p><code>show databases;</code></p>
<ul>
<li><p>新建数据库</p>
<p><code>create database 数据库名;</code></p>
<p>如新建名字为node_project的数据库</p>
<p><code>create database node_project;</code></p>
</li>
<li><p>新建表</p>
<p><code>use database_name</code></p>
<p><code>create table table_name(字段名 字段类型(长度),字段名 字段类型(长度)...);</code></p>
</li>
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<p>如在node_project的数据库下新建一个含name和password的表</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">use database node_project</span><br><span class="line"></span><br><span class="line">create table users</span><br><span class="line"></span><br><span class="line"> -> (</span><br><span class="line"></span><br><span class="line"> -> name varchar(32),</span><br><span class="line"></span><br><span class="line"> -> password varchar(64)</span><br><span class="line"></span><br><span class="line"> -> );</span><br></pre></td></tr></table></figure>
<ul>
<li>删除数据库</li>
</ul>
<p><code>drop database 数据库名;</code></p>
<p>提醒：删除操作不可撤回，数据库中的表和数据都会被删除，请勿轻易执行</p>
<ul>
<li><p>通过脚本执行sql操作</p>
<p>新建sql脚本文件，例如init.sql，在该文件的目录下输入</p>
<p><code>mysql -uroot -p密码<init.sql</code></p>
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<h1 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h1><p>其实数据结构这门课理解的门槛很低，一些算法是小学生都可以理解的，但是难就难在知识点太多，学了后面就忘了前面，有点小文科的意思。</p>
<p>教材嘛，一是为了严谨所以太学术化书面化，有理解难度；二是知识面太全，很多地方并非考试重点；三是本f人最不能接受的：全是大段文字，文字间的逻辑关系不方便get到。</p>
<p>综上，只适合第一轮学习的时候看，并不方便二轮复习再来翻阅。故自行整理笔记方便复习。</p>
<p>本笔记尽可能采用表格表示各种概念算法等之间的关系，更加直观。适合辅助教材进行学习、理解背诵、做题速查。</p>
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<p>期末复习用</p>
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