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<script>
function checkform(){
if(document.form1.Kh_f2_email.value==""){
}else{
if(!(ismail(document.form1.Kh_f2_email.value))){
alert('email格式错误!');
return false;
}
}
return true;
}
function ismail(mail)
{
return(new RegExp(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/).test(mail));
}
</script>
<body>
<form name="form1" method="post" action="">
<input type="text" name="Kh_f2_email" />
<input type="submit" name="Submit" value="提交" onclick="return checkform()" />
</form>
</body>