如何在angularjs的localstorage中从URL保存“ access_token”？

Question

如何在angularjs es6的$onInit方法中从本地存储中的URL写入access_token？当我在“应用程序”->“本地存储”选项卡中查看开发工具时，为token分配了值undefined。

import queryString from 'query-string';

class AppController {
    constructor($window, $location) {
        'ngInject'
        this.$window = $window;
        this.$location = $location;
    }

    $onInit() {
        this.$window.localStorage['token'] = 
            this.$location.search().access_token;
    } 

}

export default AppController;