[js]封装的Timer类

写了个简单Timer类，代替另类的 setInterval 函数

    /*
    * Timer类
    * @author: kmlxk@yahoo.com.cn
    * @created: 2011-2-12 18:51
    * 方法: 
    *   构造函数: Timer(间隔, 回调函数)
    *   清除: clear()
    * 使用示例: var timer = new Timer(200, function(t) {alert('nana'); t.clear();} );    
    */
    function Timer(interval, functor) {
        this.id = 'timer_'+Math.ceil(Math.random()*900000000+100000000);
        eval(this.id+' = this;');
        this.tid = setInterval(this.id+'.callback()',interval)
        this.functor = functor;
        this.callback = function(){
            this.functor(this);
        }
        this.clear = function(){
            clearInterval(this.tid);
        }
    }