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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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+ #div1{
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+ width: 200px;
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+ height: 200px;
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+ background: red;
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+ }
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+ #div2{
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+ width: 200px;
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+ height: 200px;
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+ background: blue;
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+ }
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+ .xxx{
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+ background: gray;
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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">123</div>
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+ <div id="div2">123</div>
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+
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+ <div class="xxx">222</div>
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+ <div>333</div>
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+ <div>444</div>
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+ <div class="xxx">555</div>
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+ <ul >
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+ <li class="xxx">1</li>
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+ <li>2</li>
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+ <li class="xxx">3</li>
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+ <li>4</li>
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+ <li class="xxx">5</li>
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+ <li>6</li>
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+ </ul>
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+ <ul id="ul2">
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+ <li >1</li>
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+ <li class="xxx">2</li>
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+ <li >3</li>
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+ <li class="xxx">4</li>
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+ <li >5</li>
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+ <li class="xxx">6</li>
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+ </ul>
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+
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+ <button id="btn">点击</button>
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+ <script>
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+ var btn = document.getElementById('btn')
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+
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+ var div1 = document.getElementById('div1')
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+
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+ var xxx = document.getElementsByClassName('xxx')//返回的是一个数组[]
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+ var ul1 = document.getElementsByTagName('ul')//返回的是一个数组[]
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+
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+ var ul2 = document.getElementById('ul2')
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+ var li1 = ul2.getElementsByClassName('xxx')
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+ console.log(ul1)
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+ console.log(xxx)
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+ console.log(div1)
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+ btn.onclick = function(){
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+ div1.style.background = 'green'
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+ console.log(123)
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+ }
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+ for(var i=0;i<xxx.length;i++) {
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+ xxx[i].style.background = 'green'
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+ }
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+ for(var j=0;j<ul1.length;j++){
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+ var lixxx = ul1[j].getElementsByClassName('xxx')//返回的是一个数组[]
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+ console.log(lixxx)
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+ for(var x=0;x<lixxx.length;x++){
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+ lixxx[x].style.background = 'orange'
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+ }
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+ }
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+ for(var n=0;n<li1.length;n++){
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+ li1[n].style.background = 'purple'
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+ }
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+
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+
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+
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+ </script>
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+</body>
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+</html>
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zsydgithub