Javascript 公共发布订阅组件

//发布-订阅组件
function EventContainer(){
    var _events={};
    this.subscribe=function(event,func){
        if(Object.prototype.toString.apply(_events[event])!=="[object Array]"){
            _events[event]=[];
        }
        _events[event].push(func);
    };
    this.trigger=function(event){
        var handlers = _events[event];
        if(Object.prototype.toString.apply(handlers)==="[object Array]"){
            for (var i = 0,len=handlers.length; i <len; i++) {
                handlers[i]();
            }
        }
    };
}

function ShopCartBusiness(){
    if (window.eventContainer===undefined) {
        window.eventContainer=new EventContainer();
    }

    window.eventContainer.subscribe("login",function(){
        alert("login success!");
    });
    window.eventContainer.subscribe("login",function(){
        alert("login success2!");
    });
    window.eventContainer.subscribe("regist",function(){
        alert("regist success!");
    });

    //打开登录弹窗
    var loginBox = new LoginBox();
}
var shopCart = new ShopCartBusiness();

function LoginBox(){
    if (window.eventContainer===undefined) {
        window.eventContainer=new EventContainer();
    }
    var _initEvents=function(){
        $("#btnLogin").on("click",function(){
            window.eventContainer.trigger("login");
        });
        $("#btnRegist").on("click",function(){
            window.eventContainer.trigger("regist");
        });
    };
    _initEvents();
}