邮箱和密码check | 码农工具

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>js练习</title>
<script type="text/javascript">
 function checkMail(){
    var user = document.forms["myForm"]["user"].value;
    var reg1 = new RegExp(/^(\w)+(\.\w+)*@(\w)+((\.\w+)+)$/);
    if !reg1.test(user){
       alert("123"); 
    }
 }
</script>
</head>
<body>
<form name="myForm">
    用户名: <input type="text" name="user"  value="" ><br>
    密码: <input type="text" name="password" value=""  ><br>
    <input type="submit" value="提交">
</form>
</body>
</html>
HTML