[聚合文章] jQuery+ localStorage 实现一个简易的计时器

<script>        // Stopwatchvar stopwatchInterval = 0;      // The interval for our loop.循环的间隔。 var stopwatchClock = $(".container.stopwatch").find(".clock"),    stopwatchDigits = stopwatchClock.find('span');// 检查前一个会话是否在秒表运行时结束。 //  如果是的话，按时间重新开始。 //即 关闭浏览器，点击开始，在后台保持计时的状态if(Number(localStorage.stopwatchBeginingTimestamp) && Number(localStorage.stopwatchRunningTime)){    var runningTime = Number(localStorage.stopwatchRunningTime) + new Date().getTime() - Number(localStorage.stopwatchBeginingTimestamp);    localStorage.stopwatchRunningTime = runningTime;    startStopwatch();}//如果前一个会话有运行时间，就把它写在时钟上。// 如果没有初始化为0。 //即结束时不可刷新if(localStorage.stopwatchRunningTime){    stopwatchDigits.text(returnFormattedToMilliseconds(Number(localStorage.stopwatchRunningTime)));  }else{    localStorage.stopwatchRunningTime = 0;} /* 实现开始结束 */        $("#stopwatch-btn-start").toggle(function() {             $(this).text ('开始').css("background", "#3bb4f2");              if(stopwatchClock.hasClass('inactive')){              startStopwatch()    }                  }, function() {                         $(this).text ('结束').css("background", "red");              pauseStopwatch();        })        // Pressing the clock will pause/unpause the stopwatch.//按下暂停/恢复的时钟秒表/*stopwatchClock.on('click',function(){    if(stopwatchClock.hasClass('inactive')){        startStopwatch()    }    else{        pauseStopwatch();    }});*//*开始计时*/function startStopwatch(){    // 防止多个间隔同时进行。     clearInterval(stopwatchInterval);    var startTimestamp = new Date().getTime(),        runningTime = 0;    localStorage.stopwatchBeginingTimestamp = startTimestamp;    // 应用程序还记得上一次会话运行了多长时间。     if(Number(localStorage.stopwatchRunningTime)){        runningTime = Number(localStorage.stopwatchRunningTime);    }    else{        localStorage.stopwatchRunningTime = 1;    }    // 每隔100ms重新计算运行时间，计算公式是     //   当你上次启动时钟+上次运行时间     stopwatchInterval = setInterval(function () {        var stopwatchTime = (new Date().getTime() - startTimestamp + runningTime);        stopwatchDigits.text(returnFormattedToMilliseconds(stopwatchTime));    }, 100);    stopwatchClock.removeClass('inactive');}/*停止计时*/function pauseStopwatch(){    //  停止计时      clearInterval(stopwatchInterval);    if(Number(localStorage.stopwatchBeginingTimestamp)){        // 计算运行时间。         // 新的运行时间=上次运行时间+现在-最后一次启动         var runningTime = Number(localStorage.stopwatchRunningTime) + new Date().getTime() - Number(localStorage.stopwatchBeginingTimestamp);        localStorage.stopwatchBeginingTimestamp = 0;        localStorage.stopwatchRunningTime = runningTime;        stopwatchClock.addClass('inactive');    }}// 重置./*function resetStopwatch(){    clearInterval(stopwatchInterval);    stopwatchDigits.text(returnFormattedToMilliseconds(0));    localStorage.stopwatchBeginingTimestamp = 0;    localStorage.stopwatchRunningTime = 0;    stopwatchClock.addClass('inactive');}*/function returnFormattedToMilliseconds(time){    var         seconds = Math.floor((time/1000) % 60),        minutes = Math.floor((time/(1000*60)) % 60),        hours = Math.floor((time/(1000*60*60)) % 24);    seconds = seconds < 10 ? '0' + seconds : seconds;    minutes = minutes < 10 ? '0' + minutes : minutes;   return hours + ":" + minutes + ":" + seconds;}
                
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