JS定时任务封装

/**
 * 定时任务
 * 间隔时间,执行次数,要带的参数,要执行的函数.
 */
var TimingTask = function(time,count,param,fun){
	this.id = -1;			//编号
	this.exectionCount = 0;	//执行了多少次
	if(typeof time === 'function'){
		this.fun = time;
		this.time = 3000;
		this.count = -1;
	}else
	if(typeof param === 'function'){
		this.time = time;
		this.count = count;
		this.fun = param;
	}else
	if(typeof count === 'function'){
		this.time = time*1000;
		this.fun = count;
		this.count = -1;
	}else{
		this.time = time*1000;
		this.count = count;
		this.param = param;
		this.fun = fun;
	}
}
TimingTask.prototype = {
	add : function(time,count,fun){	//间隔秒数,执行次数,执行方法
		if(typeof time === 'function'){
			this.fun = time;
		}else
		if(typeof count === 'function'){
			this.time = time;
			this.fun = count;			
		}else{
			this.time = time;
			this.count = count;
			this.fun = fun;
		}
	},
	start : function(){
		if(this.id === -1){	//说明还没开始
			this.exectionCount = 0;
			this.id = setInterval((function(param) {
				return function() {
					if(param.count > 0){
						if(param.exectionCount >= param.count){
							param.stop();
							return;
						}
					}
					param.exectionCount ++;
					param.fun(param);
				}
			})(this), this.time);
		}
	},
	stop : function(){
		clearInterval(this.id);
		this.id = -1;
	}
};

//使用方法
var chart = {test:'testString'};
var change3D = new TimingTask(0.4,1,chart,function(chartObj){	//0.4秒后改回3D效果,执行1次就够了.
					 var chart = chartObj.param;
					 alert(chart.test);				 });
				 change3D.start();	//执行