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@@ -0,0 +1,85 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta http-equiv="X-UA-Compatible" content="IE=edge">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ .xx{
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+ background: red;
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+ }
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+ #divn{
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+ width: 200px;
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+ height: 200px;
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+ background: aquamarine
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div id="div1">
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+ hhhhhhhh
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+ <div id="div3">llllllllll</div>
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+ </div>
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+ <div id="div2">xxxxxxx</div>
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+
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+ <div class="xx">11111111111111</div>
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+ <div class="xx">222222222222222222</div>
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+ <div class="xx">333333333333333</div>
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+
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+ <ul id="ul1">
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+ <li>1</li>
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+ <li>2</li>
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+ <li>3</li>
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+ </ul>
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+ <ul id="ul2">
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+ <li class="xx">4</li>
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+ <li>5</li>
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+ <li class="xx">6</li>
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+ <li>7</li>
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+ <li class="xx">8</li>
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+ <li>9</li>
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+ </ul>
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+ <button id="btn">点击</button>
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+ <div id="divn">我是正方形</div>
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+ <script>
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+ var div1 = document.getElementById('div1')
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+ var xx = document.getElementsByClassName('xx') // 数组
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+
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+ var ul1 = document.getElementById('ul1')
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+ var uli = ul1.getElementsByTagName('li')
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+
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+ var ul2 = document.getElementById('ul2')
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+ var xli = ul2.getElementsByClassName('xx')
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+
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+ var btn = document.getElementById('btn')
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+ var divn = document.getElementById('divn')
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+
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+ console.log(xli)
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+ div1.onclick = function(){
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+ console.log(xx)
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+ }
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+
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+ for(var i=0;i<xx.length;i++){
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+ console.log(xx[i])
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+ xx[i].onclick = function(){
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+ console.log('我是11')
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+ }
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+ }
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+
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+ for(var i=0;i<uli.length;i++){
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+ uli[i].onclick = function (){
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+ console.log('我是uli')
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+ }
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+ }
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+
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+ for(var i=0;i<xli.length;i++){
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+ xli[i].style.background = 'yellow'
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+ }
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+
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+ btn.onclick = function(){
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+ divn.style.width = '400px'
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+ }
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+ </script>
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+</body>
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+</html>
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zsydgithub