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>
    #div1 {
      width: 200px;
      height: 200px;
      background: red;
      top: 200px;
      left: 100px;
      position: absolute
    }
  </style>
  <script>

    //等页面所有的东西全部加载完毕，执行里面的内容
    // window.onload = function () {
    //   var btn = document.getElementById('btn')
    //   console.log(btn)
    // }
  </script>
</head>

<body>
  <button id="btn">点击</button>
  <div id="div1">
    <ul>
      <li>1</li>
      <li>2</li>
      <li>3</li>
    </ul>

  </div>
  <script>
    var btn = document.getElementById('btn')
    console.log(btn)
    // var div1 = document.getElementById('div1')
    // btn.onclick = function(){
    //   div1.style.background = 'blue'
    //   div1.style.top = '400px'
    //   div1.style.left = '250px'
    // }
    var uli = document.getElementsByTagName('li')

    for (var i = 0; i < uli.length; i++) {
      uli[i].index = i
      console.log(uli[2].index)
    }
  </script>
</body>

</html>