A way to write js email verification method

Verify Email

function check(){
var email=document.getElementById("email").value;
var isemail=/^[a-z]([a-z0-9]*[-_]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[\.][a-z]{2,3}([\.][a-z]{2})?$/i;
if (email=="") {
      alert("请输入您的邮箱!");
      return false;
    }
if (email.length>25){
     alert("长度太长");
     return false
}
if (!isemail.test(email)){
     alert("不是邮箱");
    return false;
}
}

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