js 判断邮箱格式

第一种

<script language="javascript">

function chk(objEmail){

if(!/^\w+@\w+(\.\w+){1,3}$/.test(objEmail.value)){

alert('error email !');

objEmail.focus();

return false

}

return true

}

</script>



<form name="form1" onsubmit="return chk(uEmail)">

Your Email : <input id="uEmail" name="uEmail" style="width:200px" />

<input type="submit" value="提交" />

</form>

第二种是正则表达

//Email;

function isEmail(s){

s = trim(s);

var p = /^[_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.){1,4}[a-z]{2,3}$/i;

return p.test(s);

}