原型 - firstDescendant() 方法

此方法返回作为元素的第一个子级。这与返回任何节点的 firstChild DOM 属性相反。

语法

element.firstDescendant();

返回值

它返回一个 HTML 元素。

示例

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            desc = $('grandfather').firstDescendant();
            alert("First Descendant is : " + desc.nodeName + ':' + desc.innerHTML );
            child = $('grandfather').firstChild;
            alert("First Child is : " + child.toString() );
         }
      </script>
   </head>

   <body>
      <p>Click the button to see the result.</p>
      
      <div id = "grandfather">This is grand father
         <div id = "father"> This is father.
            <div id = "kid">This is kid</div>
         </div>
      </div>
      <br />
      
      <input type = "button" value = "showResult" onclick = "showResult();"/>
   </body>
</html>

输出

prototype_element_object.htm

打印页面

上一个

下一个