lovecoding
/
VIP28


			
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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">
    <p id="p1">123</p>
    <p>456</p>
  </div>
  <script>
    var a = document.createElement('p')
    var b = document.createTextNode('789')
    console.log(a)
    console.log(b)

    a.appendChild(b)
    console.log(a)
    //appendChild 向html里面添加新元素  必须先创建元素接待你 然后追加
    var div1 = document.getElementById('div1')
    // div1.appendChild(a)

    var p1 = document.getElementById('p1')
    //insertBefore(参数1，参数2)  向参数2前面添加参数1
    // div1.insertBefore(a,p1)
    

    //xx.remove()在页面中删除xx节点
    // p1.remove()


    //xx.removeChild()移除XX里面的子节点
    // div1.removeChild(p1)

    //xx.replaceChild(新节点，旧节点)
    div1.replaceChild(a,p1)
  </script>
</body>
</html>