firstChild运行为object? - JavaScript论坛

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firstChild运行为object?

程序代码：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www. <head>
        <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
        <title>Untitled Document</title>
    </head>

    <body>
      <p id="p1"><b>hello</b>world</p>
      <input type="button" value="use ranges" onclick="useRanges()">
      <table border="0">
          <tr>
              <td>
                  <fieldset>
                 
                    <legend>oRange1</legend>
                    startContainer:<input type="text" id="txtStartContainer1"><br/>
                    startoffset:<input type="text" id="txtStartOffset1"><br/>
                    endContainer:<input type="text" id="txtEndContainer1"><br/>
                    endoffset<input type="text" id="txtEndOffer1"><br/>
                    commonancestor:<input type="text" id="txtCommonAncestor1"><br/>
                                    </fieldset>
               
              </td>
          </tr>
       
      </table>
        </html>    <script>
var oP1=document.getElementById("p1");
var oHello=oP1.firstChild.firstChild.tagName;
alert(oHello);
    </script>

运行结果为什么是object?

[ 本帖最后由 H 于 2010-3-4 19:47 编辑 ]

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