lovecoding
/
VIP22


			
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							<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    #div1{
      width: 200px;
      height: 200px;
      background: red;
    }
    .xxx{
      width: 100px;
      height: 100px;
      background: aqua;
    }
  </style>
</head>
<body>
  <div id="div1">123</div>
  <div id="div2">222</div>
  <div class="xxx">3333</div>
  <div>4444</div>
  <div>5555</div>
  <div class="xxx">6666</div>
  <button id="btn">点击换颜色</button>


  <ul>
    <li>123</li>
    <li>123</li>
    <li>123</li>
    <li>123</li>
    <li>123</li>
    <li>123</li>
  </ul>
  <ul id="ul1">
    <li class="xixi">123</li>
    <li>123</li>
    <li class="xixi">123</li>
    <li>123</li>
    <li class="xixi">123</li>
    <li>123</li>
  </ul>
  <script>
    var div1 = document.getElementById('div1')
    var btn = document.getElementById('btn')
    var xxx = document.getElementsByClassName('xxx') //返回数组[]
    var uli = document.getElementsByTagName('li')//返回数组[]
    var ul1 = document.getElementById('ul1')
    var lis = ul1.getElementsByTagName('li')
    console.log(lis)
    console.log(uli)
    console.log(div1)
    console.log(xxx)
    div1.style.background = 'yellow'
    btn.onclick = function(){
      for(var i=0;i<xxx.length;i++){
        xxx[i].style.background = 'red'
      }
    }
    for(var i=0;i<uli.length;i++){
      uli[i].style.background = 'pink'
    }
    for(var j=0;j<lis.length;j++){
      lis[j].style.background = 'green'
    }
  </script>
</body>
</html>