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 ]