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<h3 id="axios-demos这是关于axios的一般使用"><a href="#axios-demos这是关于axios的一般使用" class="headerlink" title="axios-demos这是关于axios的一般使用"></a>axios-demos这是关于axios的一般使用</h3><p>demo的相关依赖 bootstrap.css（为了美观）、vue.min.js和axios.min.js<br><br><br><img src="/images/axios的日常使用/style.jpg" alt=""><br>
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<p><strong>新建XMLHttpRequest对象：</strong></p>
<p>var request = new XMLHttpRequest();</p>
<p><br></p>
<p><strong>状态发生变化时，回调函数：</strong></p>
<p><strong>XMLHttpRequest().readyState的五种状态:</strong><br>0 － （未初始化）还没有调用send()方法<br>1 － （载入）已调用send()方法，正在发送请求<br>2 － （载入完成）send()方法执行完成，已经接收到全部响应内容<br>3 － （交互）正在解析响应内容<br>4 － （完成）响应内容解析完成，可以在客户端调用了</p>
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<h4 id="1-css的选择器有哪些，优先级是怎么样的？"><a href="#1-css的选择器有哪些，优先级是怎么样的？" class="headerlink" title="1. css的选择器有哪些，优先级是怎么样的？"></a>1. css的选择器有哪些，优先级是怎么样的？</h4><p>参考答案：1.通用选择器、2.标签选择器、3.id选择器、4.class选择器、5.组合选择器、6.属性选择器<br>优先级：1.同类型、同级别的选择器，后者由于前者、2.id>类样式>标签>*<br><br></p>
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<a class="post-title-link" href="/2017/06/26/chapter01-渲染并展示三维对象2/" itemprop="url">chapter01---渲染并展示三维对象2</a></h2>
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<h3 id="使用动画扩展场景"><a href="#使用动画扩展场景" class="headerlink" title="使用动画扩展场景"></a>使用动画扩展场景</h3><div class="note success"><p>引入requestAnimationFrame()方法 </p>
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<p>其实我们可以通过setInterval()方法指定函数每隔一个间隔调用一次函数，但是setInterval()方法并无法跟显示器的重画同步。这会导致较高的cpu使用率。所以这里我们使用requestAnimationFrame()方法取代setInterval()。<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">var</span> step = <span class="number">0</span>;</div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">renderScene</span>(<span class="params"></span>) </span>{</div><div class="line"> stats.update();</div><div class="line"> <span class="comment">// 转动方块</span></div><div class="line"> cube.rotation.x += <span class="number">0.02</span>;</div><div class="line"> cube.rotation.y += <span class="number">0.02</span>;</div><div class="line"> cube.rotation.z += <span class="number">0.02</span>; </div><div class="line"> <span class="comment">// 弹跳小球</span></div><div class="line"> step += <span class="number">0.04</span>;</div><div class="line"> sphere.position.x = <span class="number">20</span> + ( <span class="number">10</span> * (<span class="built_in">Math</span>.cos(step)));</div><div class="line"> sphere.position.y = <span class="number">2</span> + ( <span class="number">10</span> * <span class="built_in">Math</span>.abs(<span class="built_in">Math</span>.sin(step)));</div><div class="line"> </div><div class="line"> requestAnimationFrame(renderScene);</div><div class="line"> renderer.render(scene, camera);</div><div class="line">}</div><div class="line">$(<span class="string">'#WebGL-output'</span>).append(renderer.domElement);</div><div class="line">renderScene()</div></pre></td></tr></table></figure></p>
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<h3 id="首先我们要做的效果具体如下："><a href="#首先我们要做的效果具体如下：" class="headerlink" title="首先我们要做的效果具体如下："></a>首先我们要做的效果具体如下：</h3><p><img src="/images/chapter01---渲染并展示三维对象/chapter01-02.jpg" alt=""></p>
<div class="note success"><p>那我们应该怎么去使用three.js来做出这种效果呢？ </p>
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