发布订阅者模式 JavaScript版

function Subscriber() {
    this.subs = [];
}
Subscriber.prototype.subscribe = function (sub) {
    console.log("add sub");
    if(this.subs.indexOf(sub) < 0){
        this.subs.push(sub);
    }
};

Subscriber.prototype.unsubscribe = function(sub){
    console.log("unsubscribe");
    for(var i=0; i<this.subs.length; i++){
        if(sub === this.subs[i]){
            this.subs.splice(i, 1);
        }
    }
};

Subscriber.prototype.publish = function () {
    console.log("publish");
    this.subs.forEach(function (cb) {
         cb();
    });
};

var subsriber = new Subscriber();

function func1() {
    console.log("func1");
}
function func2() {
    console.log("func2");
}
function func3() {
    console.log("func3");
}


subsriber.subscribe(func1);
subsriber.subscribe(func2);
subsriber.subscribe(func2);
subsriber.subscribe(func3);
subsriber.unsubscribe(func2);


subsriber.publish();

代码结构很清晰