Js 正则 邮箱验证
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD><TITLE> New Document </TITLE><META NAME="Generator" CONTENT="EditPlus"><META NAME="Author" CONTENT=""><META NAME="Keywords" CONTENT=""><META NAME="Description" CONTENT=""></HEAD><BODY><script language="javascript">function check(){var email=document.getElementById("email").value;var isemail=(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) 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;}}</script><FORM METHOD=POST ACTION="" onsubmit="return check()"><INPUT TYPE="text" NAME="email"><INPUT TYPE="submit"></FORM></BODY></HTML>