个回答

• 冖儿

  2019-03-18 13:21:40

  /**

  * 事件

  * 观察者模式

  */

  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) { //修正没有事件直接删除空数组

  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; //修正带返回

  }

  
  

  return function() {

  this.on =

  this.subscribe = bind;

  this.off =

  this.unsubscribe = unbind;

  this.trigger =

  this.publish = trigger;

  this.one = one;

  return this;

  };

  })([].slice);

  
  

  0

• 程序猿chen

  2016-01-19 21:48:34

  没有引用observer.js 

  0