原型 - firstDescendant() 方法

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此方法返回作為元素的第一個子級。這與返回任何節點的 firstChild DOM 屬性相反。

語法

element.firstDescendant();

返回值

它返回一個 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>

輸出

prototype_element_object.htm
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