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>
</head>
<body>
  <div id="div1" class="content">hello</div>
  <div class="content">word</div>
  <ul id="ul1">
    <li>1</li>
    <li>2</li>
    <li>3</li>
  </ul>
  <ul id="ul2">
    <li>4</li>
    <li>5</li>
    <li>6</li>
  </ul>
  <script>
    // var div1 = document.getElementById('div1')
    // console.log(div1)
    // var div2 = document.getElementsByClassName('content')
    // console.log(div2)
    // var div3 = document.getElementsByTagName('div')
    // console.log(div3)

    /* 
    querySelector  获取元素
    只获取第一个元素
    */
    // var div1 = document.querySelector('#div1')
    // console.log(div1)
    // var div2 = document.querySelector('.content')
    // console.log(div2)
    // var div3 = document.querySelector('div')
    // console.log(div3)

    /* 
    querySelectorAll 查找所有满足条件的元素
    返回的是一个nodeList  类数组  不是真正的数组  不太具备数组的方法
    */
    var aLi = document.querySelectorAll('li')
    console.log(aLi)
    var a = []
    console.log(a)

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

    var ul2 = document.querySelector('#ul2')
    console.log(ul2)
    var li1 = ul2.querySelectorAll('li')
    console.log(li1)
  </script>
</body>
</html>