简单的发布订阅者模式的实现

observer.js

var Observer = function () {

};

Observer.prototype = {
  constructor: Observer,
  subscribe: function (eventName, func) {
    if (!this[eventName]) this[eventName] = [];
    this[eventName].push(func);
  },
  publish: function (eventName, data) {
    var _this = this;
    if (!this[eventName]) this[eventName] = [];
    this[eventName].forEach(function (func) {
      func.call(_this, data);
    });
  }
};

使用:

var ob = new Observer();
// 订阅
ob.subscribe('dialog', function (data) {
  console.log('there are data:' + data);
});
// 发布
ob.publish('dialog', [1, 2, 3, 4]);