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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.item-header{
font-size:20px;
color:green
}
</style>
</head>
<body>
<div id="app">
</div>
<script src="./vdom.js"></script>
<script>
// 旧的 VNode
const prevVNode = createElement('div', null, [
createElement('p', { key: 'a' ,style:{color:'blue'}}, '节点1'),
createElement('p', { key: 'b' ,'@click':()=>{alert('呵呵')}}, '节点2'),
createElement('p', { key: 'c' }, '节点3'),
createElement('p', { key: 'd'}, '节点4'),
])
// 新的 VNode
const nextVNode = createElement('div', null, [
createElement('p', { key: 'd' }, '节点4'),
createElement('p', { key: 'a' ,style:{color:'red'}}, '节点1'),
createElement('p', { key: 'b' ,'@click':()=>{alert('哈哈')}}, '节点2'),
createElement('p', { key: 'f' }, '节点6'),
createElement('p', { key: 'e' ,class:"item-header"}, '节点5'),
])
render(prevVNode, document.getElementById('app'))
// 2秒后更新
setTimeout(() => {
render(nextVNode, document.getElementById('app'))
}, 1000)
</script>
</body>
</html>