How to delete node in javascript-JS Tutorial-php.cn

How to delete node in javascript

藏色散人

Release： 2023-01-03 09:31:47

Original

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Javascript method to delete a node: 1. Use the remove() method to delete all elements on the parent node, including all text and child nodes; 2. Use the removeChild() method to delete a child node on the parent node.

How to delete node in javascript

The operating environment of this article: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

Method 1: Use remove() to delete a node

The remove() method can be used to delete all elements on the parent node, including all text and child nodes.

Example: Delete all child nodes li on the ul node

<!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>

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How to delete node in javascript

Method 2: Use removeChild ()Delete node

removeChild() method is used to delete a child node on the parent node.

Example: Delete all child nodes li on the ul node

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head> 
  
<body> 
    <ul style="border: 2px dashed #D58C00;"> 
        <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 child = e.lastElementChild;  
        while (child) { 
            e.removeChild(child); 
            child = e.lastElementChild; 
        } 
    } 
    var btn = document.getElementById("btn").onclick = function() { 
        deleteChild(); 
    } 
</script> 
  
</html>

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How to delete node in javascript

[Recommended learning: js Basic tutorial】

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