HTML DOM hasChildNodes()用法及代码示例

如果给定节点具有子节点，则HTML hasChildNodes()属性将返回true，否则将返回false。空白行或空白也被视为子节点，因此它在空白行或空白中也返回true。先决条件DOM(文档对象模型)

参数：
无需参数。

返回值：HTML nodeValue属性返回以下类型的值。

真正如果给定的节点具有子级或空格或空白行。
假如果给定的节点没有任何孩子。

用法

node.hasChildNodes()

示例1：在以下段落中，标记没有任何内容，因此返回false

<!DOCTYPE html> 
<html> 
  
<body> 
  
    <head> 
        <script> 
  
            // utility function to demonstarte hasChildNode  Property 
            function exampleFunction() { 
                
                // var x used to get the information of those node  
                // for which you want to perform  
                // hasChildNode properties 
                var res =  
                document.getElementById("divId").hasChildNodes(); 
                
                document.getElementById("GeeksForGeeks"+ 
                ).innerHTML = res; 
            } 
        </script> 
    </head> 
  
    <!--In this example we will create a node of the type div 
     and a button which calls a function name "exampleFunction"  
     on clicking of this button it will show the properties of  
     hasChildNode property -->
    <p id="divId"></p> 
    <br> 
  
    <button onclick="exampleFunction()"> 
      click to know the paragraph tag has any child node 
    </button> 
    
    <!-- below paragraph Tag is used to  
    print the value of nodeValue properties-->
    <p id="GeeksForGeeks"></p> 
</body> 
  
</html>

输出：

例2：在下面的段落中，标签有一个消息，因此返回true

<!DOCTYPE html> 
<html> 
  
<body> 
  
    <head> 
  
        <script> 
  
            // utility function to demonstarte hasChildNode Property 
            function exampleFunction() { 
  
                // var x used to get the information of those nodes 
                // for which you want to perform  
                // hasChildNode properties. 
                var res =  
                document.getElementById("divId").hasChildNodes(); 
                
                document.getElementById("GeeksForGeeks"+ 
                ).innerHTML = res; 
            } 
        </script> 
    </head> 
    <!--In this example we will create a node of the type div 
     and a button which calls a function name "exampleFunction"  
     on clicking of this button it will show the properties of  
     hasChildNode property -->
    <p id="divId">Hello geeksforgeeks</p> 
    <br> 
  
    <button onclick="exampleFunction()"> 
      click to know the paragraph tag has any child 
    </button> 
    
    <!-- below paragraph Tag is used to print the  
         value of nodeValue properties-->
    <p id="GeeksForGeeks"></p> 
</body> 
  
</html>

输出：

支持的浏览器：DOM click()方法支持的浏览器如下：

谷歌浏览器
苹果Safari
火狐浏览器
Opera
边

相关用法

注：本文由纯净天空筛选整理自Shahnawaz_Ali大神的英文原创作品 HTML | DOM hasChildNodes() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。