观察者模式

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js观察者模式

<!DOCTYPE><html> <head>  <title> New Document </title>  <meta name="Generator" content="EditPlus">  <meta name="Author" content="">  <meta name="Keywords" content="">  <meta name="Description" content="">  <meta content="text/html" charset="utf-8"> </head><style>div{margin:10px;width:500px;height:200px;border:1px solid red;}#ad{border: 1px solid blue;}</style> <script> window.onload = function(){ var sel = document.getElementById('subject'); sel.observers = {}; var content = document.getElementById('content'); var ad = document.getElementById('ad'); var study = document.getElementById('study'); //添加观察者 sel.attach = function(key,obj){ this.observers[key] = obj; } //删除观察者 sel.detach = function(key){ delete this.observers[key]; } //通知观察者 sel.onchange = sel.notice = function(){ for(var key in this.observers){ this.observers[key].update(this); } } //观察者更新规则 content.update = function(subject){ if(subject.value == 'male') this.style.background = 'blue'; else if(subject.value == 'female') this.style.background = 'pink'; } ad.update = function(subject){ if(subject.value == 'male') this.innerHTML = '汽车'; else if(subject.value == 'female') this.innerHTML = '美容'; } study.update = function(subject){ if(subject.value == 'male') this.innerHTML = '如何年薪百万，迎娶白富美'; else if(subject.value == 'female') this.innerHTML = '如何做美丽女强人'; } //添加观察者 sel.attach('content',content); sel.attach('ad',ad); sel.attach('study',study); } </script> <body>  <h1>观察者模式切换</h1>  <select name="" id="subject"><option value="male">男式风格</option><option value="female">女士风格</option>  </select>  <div id="content">我是内容</div>  <div id="ad">我是广告</div>  <div id="study">学习</div> </body></html>

php观察者模式

<?php//被观察对象类class user implements SplSubject{    public $lognum;    public $hobby;    public function __construct($hobby){        $this->lognum = rand(1,10);        $this->hobby = $hobby;        $this->observers = new SplObjectStorage();      //spl标准库对象，存储观察者的存储对象    }    public function login(){        $this->notify();    }    public function attach(SplObserver $observer){        $this->observers->attach($observer);    }    public function detach(SplObserver $observer){        $this->observers->detach($observer);    }    public function notify(){        $this->observers->rewind();     //将指针指向对象头部        while($this->observers->valid()){            $observer = $this->observers->current();    //弹出一个观察者对象            $observer->update($this);            $this->observers->next();        }    }}//观察者类class secrity implements SplObserver{   public function update(SplSubject $subject){        if($subject->lognum <3)            echo '这是你第'.$subject->lognum.'次登录';        else            echo '这是你第'.$subject->lognum.'次登录,登录异常';   }}class ad implements SplObserver{    public function update(SplSubject $subject){        if($subject->hobby == 'sport')            echo "\n".'直播欧冠决赛';        else            echo "\n".'买买买';    }}//进行观察$user = new user('sport');$user->attach(new secrity());$user->attach(new ad());$user->login();

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