lovecoding
/
VIP30


			
				
					
						
						
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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>
</head>

<body>
  <ul id="list1">
    <li>1</li>
    <li>2</li>
    <li>3</li>
  </ul>
  <button id="btn">添加</button>
  <script>
    var list1 = document.getElementById('list1')
    var btn = document.getElementById('btn')
    var aLi = document.getElementsByTagName('li')

    // for (var i = 0; i < aLi.length; i++) {
    //   aLi[i].onclick = function(){
    //     console.log(this.innerHTML)
    //   }
    // }

    btn.onclick = function(){
      var a = document.createElement('li')
      a.innerHTML = Math.random()
      list1.appendChild(a)
      // console.log(this)
    }
    

    list1.onclick = function(e){
      // console.log(e.target.tagName)
      if(e.target.tagName == 'LI'){
        console.log(e.target.innerHTML)
      }
      console.log(this)
    }
  </script>
</body>

</html>