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Detailed explanation of how to use JavaScript dom to create and delete html element instances

伊谢尔伦Original: 2017-07-20 13:16:471566browse

Using DOM, you can create new HTML elements and delete existing HTML elements.

(1) New element:

<script>
  //创建新的 <p> 元素
  var newEle=document.createElement("p");
  //创建文本节点
  var node=document.createTextNode("这是使用Javascript创建的新段落。");
  //将文本节点添加到新创建的 <p> 元素中
  newEle.appendChild(node);
  var p1_ele=document.getElementById("p1");
  //将新创建的元素添加到已有的元素中
  p1_ele.appendChild(newEle);
</script>

(2) Delete HTML element

<script>
   //删除一个元素时，必须首先获取到它的父元素
   function deleteEle(){
    var parent = document.getElementById("p_02");
    var child = document.getElementById("p_02_p2");
    parent.removeChild(child);
   }
   //使用代码获取元素的父元素
   function deleteEle3(){
    var child = document.getElementById("p_02_p3");
    child.parentNode.removeChild(child);
   }
</script>

Sample code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Content-Language" content="zh-cn" />
<title>Javascript 节点</title>
<head>
 <style>
  body {background-color:#e6e6e6}
 </style>
</head>
<body>
 <h3>（一）添加元素</h3>
 <p id="p1">
  <p id="p1">这是一个段落</p>
  <p id="p2">这是另一个段落</p>
 </p>
 <script>
  //创建新的 <p> 元素
  var newEle=document.createElement("p");
  //创建文本节点
  var node=document.createTextNode("这是使用Javascript创建的新段落。");
  //将文本节点添加到新创建的 <p> 元素中
  newEle.appendChild(node);
  var p1_ele=document.getElementById("p1");
  //将新创建的元素添加到已有的元素中
  p1_ele.appendChild(newEle);
 </script>
 <h3>（二）删除元素</h3>
 <p id="p_02">
  <p id="p_02_p1">这是一个段落</p>
  <p id="p_02_p2">这是另一个段落</p>
  <button onclick="deleteEle()">删除id为‘p_02_p2&#39;的元素</button><br/>
  <p id="p_02_p3">这是第三个段落</p>
  <button onclick="deleteEle3()">删除id为‘p_02_p3&#39;的元素（自动获取父元素）</button>
  <script>
   //删除一个元素时，必须首先获取到它的父元素
   function deleteEle(){
    var parent = document.getElementById("p_02");
    var child = document.getElementById("p_02_p2");
    parent.removeChild(child);
   }
   //使用代码获取元素的父元素
   function deleteEle3(){
    var child = document.getElementById("p_02_p3");
    child.parentNode.removeChild(child);
   }
  </script>
 </p>
</body>
</html>

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