判断是否跨域

//判断是否跨域
    var isCrossDomain = function(){
        return document.domain !== "www.1905.com";//跨域
    }

            if(isCrossDomain){
                $.ajax({
                    type : "GET",
                    url  : URLS.getNews(nodeDate),
                    dataType: "jsonp",
                    jsonp: "callback",
                    jsonpCallback : "successJsonpCallback",
                    cache : true,
                    success : successHandler
                });
            }else{
                $.ajax({
                    type: "GET",
                    url: URLS.getNews(nodeDate),
                    dataType: "json",
                    success: successHandler
                });
            }