lovecoding
/
VIP20


			
				
					
						
						
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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>
    .xx{
      background: red;
    }
    #divn{
      width: 200px;
      height: 200px;
      background: aquamarine
    }
  </style>
</head>
<body>
  <div id="div1">
    hhhhhhhh
    <div id="div3">llllllllll</div>
  </div>
  <div id="div2">xxxxxxx</div>

  <div class="xx">11111111111111</div>
  <div class="xx">222222222222222222</div>
  <div class="xx">333333333333333</div>

  <ul id="ul1">
    <li>1</li>
    <li>2</li>
    <li>3</li>
  </ul>
  <ul id="ul2">
    <li class="xx">4</li>
    <li>5</li>
    <li class="xx">6</li>
    <li>7</li>
    <li class="xx">8</li>
    <li>9</li>
  </ul>
  <button id="btn">点击</button>
  <div id="divn">我是正方形</div>
  <script>
    var div1 = document.getElementById('div1')
    var xx = document.getElementsByClassName('xx') // 数组

    var ul1 = document.getElementById('ul1')
    var uli = ul1.getElementsByTagName('li')
    
    var ul2 = document.getElementById('ul2')
    var xli = ul2.getElementsByClassName('xx')

    var btn = document.getElementById('btn')
    var divn = document.getElementById('divn')

    console.log(xli)
    div1.onclick = function(){
      console.log(xx)
    }

    for(var i=0;i<xx.length;i++){
      console.log(xx[i])
      xx[i].onclick = function(){
        console.log('我是11')
      }
    }

    for(var i=0;i<uli.length;i++){
      uli[i].onclick = function (){
        console.log('我是uli')
      }
    }

    for(var i=0;i<xli.length;i++){
      xli[i].style.background = 'yellow'
    }

    btn.onclick = function(){
      divn.style.width = '400px'
    }
  </script>
</body>
</html>