<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>JavaScript</title>
</head>
<body>
<form name="Input">
<table align="center" width="500px" height="50%" border="1">
<tr>
<td align="center" width="100px">
学号:
</td>
<td align="center" width="300px">
<input type="text" id=userid name="user" onblur="validate();">
<div id=usermsg></div>
</td>
</tr>
<tr>
<td align="center" width="100px">
姓名:
</td>
<td align="center">
<input type="text" name="name">
</td>
</tr>
<tr>
<td align="center" width="%45">
性别:
</td>
<td align="center">
<input type="radio" name="sex" value="男">
男
<input type="radio" name="sex" value="女">
女
</td>
</tr>
<tr>
<td align="center" width="30%">
年龄:
</td>
<td align="center" width="300px">
<input type="text" name="age">
</td>
</tr>
<tr>
<td align="center" width="100px">
地址:
</td>
<td align="center" width="300px">
<input type="text" name="addr">
</td>
</tr>
</table>
</form>
<h1 id="myHead" onclick="getValue()"> 看看三种获取节点的方法? </h1>
<p> 点击标题弹出它的值。 </p>
<input type="button" onclick="getElements()" value="看看name为sex的节点有几个?" /> <Br>
<input type="button" onclick="getTagElements()" value="看看标签名为input的节点有几个?" />
<script type="text/javascript">
function getValue()
{
var myH = document.getElementById("myHead");
alert(myH.innerHTML); }
function getElements()
{
var myS = document.getElementsByName("sex");
alert(myS.length);
}
function getTagElements()
{ var myI = document.getElementsByTagName("input");
alert(myI.length);
}
</script>
</body>
</html>