2019年总结

/*
 * js秒表计时
 * author:maqianru
 * creactDate:2018/3/28
 */

class akumaTimer {
    constructor(options) {
        let defaultOptions = {
                element: "",
                cancelDom: "",
                startDom: "",
                againDom: "",
                num: 0, //需要格式化的时间戳
            },
            __Timer;
        this.options = Object.assign({}, defaultOptions, options);
        this.checkOption().timer().cancel().start().again();
    }
    //确保有显示时间的容器
    checkOption() {
        if(!this.options.element) {
            throw new Error("Element is required!!!")
        }
        return this
    }
    //定时器
    timer() {
        let countTime = this.options.num || 0, //累计的时间戳
            startTime = new Date().getTime(),
            nowTime,
            ms,
            sec,
            min,
            timeStr;
        this.__Timer = setInterval(() => {
            nowTime = new Date().getTime();
            this.options.num = countTime + nowTime - startTime;
            ms = Math.floor(this.options.num / 10 % 100); //毫秒
            sec = Math.floor((this.options.num / 1000) % 60); //秒
            min = Math.floor((this.options.num / 1000 / 60) % 60); //分
            timeStr = this.formatter(min) + ":" + this.formatter(sec) + ":" + this.formatter(ms);
            this.options.element.innerText = timeStr;
        }, 100)
        return this;
    }
    //暂停键
    cancel() {
        if(this.options.cancelDom) {
            this.options.cancelDom.onclick = () => {
                clearInterval(this.__Timer);
            }
        }
        return this;
    }
    //开始键
    start() {
        if(this.options.startDom) {
            this.options.startDom.onclick = () => {
                clearInterval(this.__Timer);
                this.timer()
            }
        }
        return this;
    }
    //重新开始键
    again() {
        if(this.options.againDom) {
            this.options.againDom.onclick = () => {
                clearInterval(this.__Timer);
                this.options.num = 0;
                this.timer()
            }
        }
        return this;
    }
    //格式化秒表数字
    formatter(t) {
        const res = t > 9 ? t : "0" + t;
        return res;
    }
}



/*=========================================            使用方法：            =========================================*/
/*
 *
 * new akumaTimer({
 *        element:"秒表文字显示容器",  //必填
 *         cancelDom:"暂停按钮",        //选填
 *        startDom:"继续按钮",         //选填
 *        againDom:"重新开始按钮"      //选填
 *})
 */
 /*==================================================================================================================*/