var reg = /^(?:[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(?:\\.[a-zA-Z0-9_-]+)+,?)*$/
var str ="sklj@lksd.com,clsjkd@lksd.cn";
str.match(reg);
var reg = /^(?:[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(?:\\.[a-zA-Z0-9_-]+)+,?)*$/
var str ="sklj@lksd.com,clsjkd@lksd.cn";
str.match(reg);