javascript,php,ruby观察者模式
//被观察者 function Subject() { var _this = this; this.observers = []; this.addObserver = function(obj) { _this.observers.push(obj); } this.deleteObserver = function(obj) { var length = _this.observers.length; for(var i = 0; i < length; i++) { if(_this.observers[i] === obj) { _this.observers.splice(i, 1); } } } this.notifyObservers = function() { var length = _this.observers.length; console.log(length) for(var i = 0; i < length; i++) { _this.observers[i].update(); } } } //观察者 function Observer() { this.update = function() { alert(1) } } |
//被观察者 class Subject { private $_observers; public function __construct() { $this->_observers = array(); } public function add_observer($obs) { $this->_observers[] = $obs; } public funtion delete_observer($bos) { $index = array_search($bos, $this->_observers); unset($this->_observers[$index]); } public function notify_observers() { foreach($this->_observers as $v) { $v->update(); } } } //观察者 class Observer { public function __construct() { do sth; } public function update() { do sth; } } |
require "observer" #被观察者 class Subject include Observable def notify #do sth changed #更新标志为真 notify_observers(*args) #如果更新标志为真,调用观察者带参数args的方法 end end #观察者 class Obs #回调函数,好像只能这么叫 def update #do sth end end |
Categories: 前端开发