javascript - 从服务到 Controller 获取变量

我试图从此服务获取变量，但我无法做到这一点。我已经看网上了，什么也没有。

    .factory('localStorageService', function($rootScope){
    $rootScope.go = function(task) {
        var dataReceiver = localStorage.getItem('taskData');
        var array = [];
        var newArray = array.push({"title" : task});

        if(dataReceiver === null) {
            localStorage.setItem("taskData", JSON.stringify(array));

            dataReceiver = JSON.parse(localStorage.getItem('taskData'));
            console.log(dataReceiver);
        }
        else {
            array = JSON.parse(dataReceiver);
            var newArray2 = array.push({"title" : task});
            localStorage.setItem("taskData", JSON.stringify(array));

            dataReceiver = JSON.parse(localStorage.getItem('taskData'));

            for(var i = 0; i < newArray2; i++) {
                console.log(dataReceiver[i].title);
            }
        }

        return dataReceiver;
    }
})

控制器：

.controller('PlaylistsCtrl', function($scope, PlaylistService, localStorageService) {

console.log(localStorageService.go());

}）
它说它无法读取未定义的属性go

最佳答案

您需要使用工厂所属的模块声明，这就是为什么在控制器中未定义localStorageService的原因。是的，您也不应添加到rootScope。您的工厂应如下所示：

angular.module('myApp', []).factory('localStorageService', function($rootScope){

this.go = function(task) {
    var dataReceiver = localStorage.getItem('taskData');
    var array = [];
    var newArray = array.push({"title" : task});

    if(dataReceiver === null) {
        localStorage.setItem("taskData", JSON.stringify(array));

        dataReceiver = JSON.parse(localStorage.getItem('taskData'));
        console.log(dataReceiver);
    }
    else {
        array = JSON.parse(dataReceiver);
        var newArray2 = array.push({"title" : task});
        localStorage.setItem("taskData", JSON.stringify(array));

        dataReceiver = JSON.parse(localStorage.getItem('taskData'));

        for(var i = 0; i < newArray2; i++) {
            console.log(dataReceiver[i].title);
        }
    }

    return dataReceiver;
};

return this;

}）;

通过返回工厂对象，当将其及其所有方法注入到控制器中时，它们将可用。

关于javascript - 从服务到 Controller 获取变量，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/24482965/