Email验证
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>验证Email是否正确</title>
<script language="javascript">
function checkemail(str){
//在JavaScript中，正则表达式只能使用"/"开头和结束，不能使用双引号
var Expression=/w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*/;
var objExp=new RegExp(Expression);
if(objExp.test(str)==true){
return true;
}else{
return false;
}
}
function check(myform){
if(myform.email.value==""){
alert("请输入Email地址!");myform.email.focus();return;
}
if(!checkemail(myform.email.value)){
alert("您输入Email地址不正确!");myform.email.focus();return;
}
myform.submit();
}
</script>
</head>
<body>
<form name="form1" method="post" action="">
<table width="100%" height="276" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="16%" height="36" align="center">留言人：</td>
<td width="84%">
<input name="author" type="text" id="author" size="30" title="留言人"></td>
</tr>
<tr>
<td height="38" align="center">Email：</td>
<td><input name="email" type="text" id="email" size="72" title="Email地址">
* </td>
</tr>
<tr>
<td height="42" align="center"> </td>
<td><input name="Submit" type="button" class="btn_grey" value="保存" onClick="check(form1)">
<input name="Submit2" type="reset" class="btn_grey" value="重置"> </td>
</tr>
</table>
</form>
</body>
</html>