矩形承諾的范圍然后起作用

Question

我試圖理解我在restangular服務上調用的then函數的范圍。 我試圖僅在重新約定約定解決時才在服務內調用函數。

angular.module('app').service('test', function(rest) {
    this.doSomething = function() {
        console.log(this); // this logs the current object im in
        rest.getSomething().then(function(data) {
            console.log(this); // this logs the window object
            this.doSomethingElse(); // this is what I want to call but is is not in scope and I cant seem to get my head around as to why.
        }
    };
    this.doSomethingElse = function() {
        // Do something else
    };
});

Answer 1

您可以使用緩存this當時的回調中。

angular.module('app').service('test', function (rest) {
    this.doSomething = function () {
        var self = this; // Cache the current context

        rest.getSomething().then(function (data) {
            self.doSomethingElse(); // Use cached context
        });
    };

    this.doSomethingElse = function () {
        // Do something else
    };
});

您還可以將函數引用用作

rest.getSomething().then(this.doSomethingElse);