Question

我有一个像这样的设定间隔函数 -

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);

以下是我在invokeRemoteService()处的RestClient方法（在另一个档案中） -

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，successCallback和errorCallback label-1 label-3 label-5总是'未定义'和label-2. The。虽然服务调用完美，但我在work fine for other. But when I call it from RestClient.invokeRemoteService（）const sudoku = [ [1, 2, 3, 4], [3, 4, 1, 2], [2, 3, 4, 1], [4, 1, 2, 3] ] class SudokuChecker { getCheckList (length) { const nums = {} for (let i=1; i<=length; i++) nums[i] = 0 return nums } isCorrect (list) { const checkList = this.getCheckList(list.length) list.forEach(num => checkList[num]++) return Object.values(checkList).every(x => x == 1) } getRow (matrix, row) { return matrix[row] } getColumn (matrix, col) { return matrix.map(row => row[col]) } getBox (matrix, box) { const procNum = Math.sqrt(matrix.length) // given some box ID number (starting at 0), all I need : // a) index of that box's top row const topRow = 'find_me' // calculated with "box" and procNum somehow... // b) the index of that box's first num at that row. const sliceFrom = 'find_me' // no idea at the moment how to calculate... let boxNums = [] for (let i=0; i<procNum; i++) { boxNums = boxNums.concat(matrix[topRow + i].slice(sliceFrom, sliceFrom + procNum)) } return boxNums } checkLists (matrix, type, unit=0) { const pass = this.isCorrect(this['get'+type](matrix, unit)) if (!pass) return false if (unit == matrix.length-1) return pass return this.checkLists(matrix, type, ++unit) } checkAll (matrix) { const types = ['Row', 'Column', 'Box'] return types.map(t => this.checkLists(matrix, t)).every(x => x === true) } } setInterval（）`得到了正确的数据。请帮忙。

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);

从方法引用中捕获with回调函数

1 个答案: