JS验证邮箱

function CheckEmail() {
 //获取用户输入的邮箱地址相关的信息
 var EmailString = document.getElementById("email").value;
 var strLength = EmailString.length;
 var index1 = EmailString.indexOf("@");
 var index2 = EmailString.indexOf(".", index1);
 var msg;
 //返回相关的验证信息
 if (index1 == -1 || index2 == -1 || index2 <= index1 + 1 || index1 == 0 || index2 == strLength - 1)
  {
  msg = "邮箱地址不合法!";
  alert(msg);
  return false;
 }
 return true;
}