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How to delete nodes in javascript
- 青灯夜游Original
- 2021-04-01 15:24:2312307browse
Javascript method to delete a node: 1. Use the remove() method, which can be used to delete all elements on the parent node, including all text and child nodes; 2. Use the removeChild() method, which can be used to delete the parent node. a child node of .
The operating environment of this tutorial: Windows 7 system, ECMAScript version 5, Dell G3 computer.
In JavaScript, you can use the removeChild() or remove() method to delete nodes.
1. Use removeChild() to delete a node.
The removeChild() method deletes a specified child node of the specified element. Returns the deleted node as a Node object, or null if the node does not exist.
Syntax
node.removeChild(node)
node: required. The node object you wish to delete.
Example:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<ul id="myList"><li>Coffee</li><li>Tea</li><li>Milk</li></ul>
<p id="demo">单击按钮移除列表的第一项</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
var list=document.getElementById("myList");
list.removeChild(list.childNodes[0]);
}
</script>
</body>
</html>Rendering:
[Recommended learning: js Basic Tutorial】
2. Use the remove() method to delete nodes
The remove() method can be used to delete all elements on the parent node, including all text and child nodes.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<ul style="border: 2px dashed #006DAF;">
<li>Get Up in Morning</li>
<li>Do some exercise</li>
<li>Get Ready for school</li>
<li>Study Daily</li>
<li>Do homework</li>
</ul>
<input id="btn" type="button" value="删除子节点">
</body>
<script>
function deleteChild() {
var e = document.querySelector("ul");
var first = e.firstElementChild;
while (first) {
first.remove();
first = e.firstElementChild;
}
}
var btn = document.getElementById("btn").onclick = function() {
deleteChild();
}
</script>
</html>Rendering:
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