/** * 事件 * 觀察者模式 */ var Observer = (function(slice) { function bind(event, fn) { var events = this.events = this.events || {}, parts = event.split(/\s+/), i = 0, num = parts.length, part; if (events[event] && events[event].length) return this; for (; i < num; i++) { events[(part = parts[i])] = events[part] || []; events[part].push(fn); } return this; } function one(event, fn) { this.bind(event, function fnc() { fn.apply(this, slice.call(arguments)); this.unbind(event, fnc); }); return this; } function unbind(event, fn) { var events = this.events, eventName, i, parts, num; if (!events) return; parts = event.split(/\s+/); for (i = 0, num = parts.length; i < num; i++) { if ((eventName = parts[i]) in events !== false) { events[eventName].splice(events[eventName].indexOf(fn), 1); if (!events[eventName].length) { //修正沒有事件直接刪除空數(shù)組 delete events[eventName]; } } } return this; } function trigger(event) { var events = this.events, i, args, falg; if (!events || event in events === false) return; args = slice.call(arguments, 1); for (i = events[event].length - 1; i >= 0; i--) { falg = events[event][i].apply(this, args); } return falg; //修正帶返回 } return function() { this.on = this.subscribe = bind; this.off = this.unsubscribe = unbind; this.trigger = this.publish = trigger; this.one = one; return this; }; })([].slice);