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...[ 查看全文 ]