1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2 <html xmlns="http://www.w3.org/1999/xhtml">
3 <head>
4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
5 <title>验证是否为空</title>
6 <script type="text/javascript">
7 function checkForm(yourinfo){
8 if(yourinfo.namestring.value==""||yourinfo.namestring.value==null){
9 alert("请输入你的名字");
10 return(false);
11 }
12 else{
13 return(true);
14 }
15 }
16 </script>
17 </head>
18
19 <body>
20 <form name="info" method="post" onSubmit="return checkForm(this);">
21 <p>姓名：<input type="text" name="namestring" size="60"/></p>
22 <p><input type="submit" value="提交" /> <input type="reset" value="重置" /></p>
23 </form>
24 </body>
25 </html>
