ajax发送多个跨域请求回调不混乱

    var count = 0;
    var codes = "";
    function refreshCache(urls){
        try {
            var url = urls.split(",");
            if(url.length <=0){
                alert("刷新失败，请配置刷新地址！");
                return;
            }
            count = 0;
            refesh(url);
       }catch(err){
           alert("请求失败。");  
       }
    } 

 function refesh(url){
        var u = url[count];
        console.log("第"+count+"个"+u);
        $.ajax({
            url : u,
            type : 'POST',
            dataType: "jsonp",
            timeout: 2000,
            cache:false,
            async:false,
            jsonpCallback: "jsonpcallback",
            success : function(data, status, xhr) {
                console.log(u+"回调被执行了... 参数为："+data);
                if(data == '0000'){
                    console.log(u+"回调执行成功");
                    count++;
                    if(count <20 && count < url.length){
                        refesh(url);
                    }
                }else{
                    console.log(u+"回调执行失败");
                    alert("刷新失败，请稍后再试");
                }
            },
            error : function(xhr, error, exception) {  
                alert("请求失败。");  
            }
        });
　　}