如何防止角度提供程序多次加载

Question

I have a provider (I also tried with controller with same results). This is my code:

.provider('socketio', function() {
    this.socket = io.connect("//localhost);
    console.log("LISTENING...");

    this.$get = function() { [...] }
});

I'm injecting this way:

.controller('HeaderCtrl', function($rootScope, $scope, login) { [...] }

and

.factory('login', function($location, socketio, $rootScope) {

    // socketio operations

})

But in my console, I see two LOGS, infact, i have two socketio listening each of them with a event listener. My console is full with doubled messages.

Any hint? Thanks.

Answer 1

Providers are meant to be "factories", hence they must not directly build the service they provide but just offer a get method to be called by Angular to get a factory. Their use is clearly described in the Angular documentation . So maybe you should move the io.connect call inside the $get method.