最近写了一个倒计时的控件，共享出来方便使用

用法：var stopwatch = new Stopwatch(“倒计时间/秒”,”倒计时完成时的回调函数”,”每个计时事件回调”,”计时步长/秒”)

stopwatch.start();//开始/继续计时

stopwatch.pause();//暂时计时

stopwatch.restart();//重新开始计时

stopwatch.stop();//停止计时

(function(global, factory) {

// 兼容requirejs和普通引入模式

if (typeof module === "object" && typeof module.exports === "object") {

module.exports = global.document ? factory(global, true) : function(w) {

if (!w.document) {

throw new Error("requires a window with a document");

}

return factory(w);

};

} else {

factory(global);

}

}(typeof window !== "undefined" ? window : this, function(window, noGlobal) {

// 构造方法

var Stopwatch = function(countDownTime, stopedRecall,tickRecall,steparg) {

this.iniTime = parseInt(countDownTime);

if(typeof stopedRecall == "function"){

this.recall = stopedRecall;

}else{

console.error("回调方法必须为function");

return null;

}

if(tickRecall){

if(typeof tickRecall == "function"){

this.tick = tickRecall;

}else{

console.error("回调方法必须为function");

return null;

}

}

this.curtime = countDownTime;

this.status = "stop";

this.step = 1;

if(steparg && steparg > 0){

this.step = steparg;

}

};

if (typeof noGlobal === typeof undefined) {

if (typeof window.Stopwatch === typeof undefined) {

window.Stopwatch = Stopwatch;

} else {

Stopwatch = window.Stopwatch;

}

}

// 对象方法

Stopwatch.prototype.start = function() {

this.status = "counting";

this.curtime = this.iniTime;

this.countDown();

};

Stopwatch.prototype.stop = function() {

this.curtime = this.iniTime;

this.status = "stop";

};

Stopwatch.prototype.pause = function() {

this.status = "pause";

};

Stopwatch.prototype.restart = function() {

this.status = "counting";

this.curtime = this.iniTime;

this.countDown();

};

Stopwatch.prototype.countDown = function() {

if (this.status == "counting") {

if (this.curtime <= 0) {

this.recall();

this.status = "stop";

} else {

this.curtime = this.curtime-this.step;

var $this = this;

this.tick();

window.setTimeout(function() {

$this.countDown();

}, 1000);

}

}

};

Stopwatch.prototype.tick = function(){

if(console&&console.log){

console.log("tick:"+this.curtime);

}

};

Stopwatch.prototype.recall = function(){

if(console&&console.log){

console.log("stoped");

}

};

return Stopwatch;

}));

下载：https://github.com/wamdy/JsUtils/blob/master/src/Stopwatch.js

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