从方法引用中捕获with回调函数

Question

我有一个像这样的时间间隔函数-

setInterval(function(){ 
     var postData = {'some json data'};

     var successCallback = function(data) {
           console.log(data);
     }

     var errorCallback = function(data) {
          console.log(data);
     }

     RestClient.invokeRemoteService(postData, this.successCallback, this.errorCallback);

}, 10000);

这是我的invokeRemoteService()方法在of RestClient (在另一个文件中)-

RestClient = window.RestClient || {};

(function (w, rs) {
    rs.invokeRemoteService = function ( postData, successCallBack, errorCallBack){ //label-1, successCallback and errorCallback are undefined

            $.ajax({
                url : '/some/url/',
                dataType : "json",
                data :{
                    cmd: ko.toJSON(postData)
                },
                type : "post",
                async : true,

                success : function(data) { //label-2, get data ok
                    if (typeof successCallBack === "function") { //label-3, successCallBack is undefined
                        successCallBack(data); //label-4
                    }
                },
                error : function() {
                    if (typeof errorCallBack === "function") {
                        errorCallBack(); //label-5
                    }
                }

            });

    };
})(window, RestClient);

但是，当我从RestClient.invokeRemoteService()方法调用setInterval()方法时，在label-1、label-3和label-5中，对于successCallback和errorCallback总是得到“未定义”。虽然服务调用完成得很好，而且我在label-2. TheRestClient.invokeRemoteService()work fine for other. But when I call it fromsetInterval()`获得了正确的数据，但它不起作用。请帮帮忙。

Answer 1

不需要this，您的successCallback和errorCallback直接在范围内。

setInterval(function(){ 
     var postData = {'some json data'};

     var successCallback = function(data) {
           console.log(data);
     }

     var errorCallback = function(data) {
          console.log(data);
     }

     RestClient.invokeRemoteService(postData, successCallback, errorCallback);

}, 10000);