<script> var username; // 判断用户是否登录 if(!!visitor) { username = visitor.userName; if (!!username) { // 用户登录 }else { // 用户未登录 } } </script>
后台传过来的visitor是:
var visitor={"ip":"127.0.0.1","proxyUser":42902701917715,"role":4,"userId":"42902701917715","userName":"shzz673"};