用javascript的正则表达式来验证Email地址是否格式正确

1// 检查 E-mail 是否已被注册

2 function CheckExists()

3 {

4 var e = document.getElementById("mailaddress").value;

5 if(e != "") {

6 if(!/(\S)+[@]{1}(\S)+[.]{1}(\w)+/.test(e))

7 {

8 alert("请输入格式正确的 e-mail 地址！");

9 var email = document.getElementById ( "mailaddress" );

10 email.value = "";

11 email.focus ();

12 }

13 else

14 {

15 QuickRegisterBox.IsEMailExists(e, CheckExists_Callback);

16 }

17 }

18 }