问答详情
源自：9-9 访问子节点的第一和最后项

到底是如何输出的

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<body>
<div id="con"><p>javascript</p><div>jQuery</div><h5>PHP</h5>
</div>
<script type="text/javascript">
  var x=document.getElementById("con");
  document.write(x.firstChild.nodeName+"</br>");
  document.write(x.lastChild.nodeName+"</br>");
 
</script>
</body>
</html>

为什么下面是输出的P和#text，节点有点没懂

提问者：Luffykaiyuan4240471 2017-05-16 22:15

个回答

  • 风流水acer
    2017-05-16 23:06:32
    已采纳

    <!DOCTYPE HTML>

    <html>

    <head>

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

    <title>无标题文档</title>

    </head>

    <body>

    <div id="con">

      <p>javascript</p>

      <div>jQuery</div>

      <h5>PHP</h5>

    </div>

    <div id="con1"><p>javascript</p><div>jQuery</div><h5>PHP</h5></div>

    <script type="text/javascript">

      var x=document.getElementById("con");

     document.write(x.firstChild.nodeName+"<br>");

     document.write(x.lastChild.nodeName+"<br>");

       var x=document.getElementById("con1");

     document.write(x.firstChild.nodeName+"<br>");//显示节点名称

     document.write(x.lastChild.nodeName+"<br>");

        var x=document.getElementById("con1");

     document.write(x.firstChild.innerHTML+"<br>");//显示节点内容

     document.write(x.lastChild.innerHTML+"<br>");

    </script>

    </body>

    </html>


    3