在javascript中查找已用时间 [英] Find elapsed time in javascript

问题描述

我是JavaScript的新手，我正在尝试编写一个代码，用于计算从用户登录到当前时间所经过的时间。

I'm new to JavaScript and I'm trying to write a code which calculates the time elapsed from the time a user logged in to the current time.

这是我的代码： -

Here is my code:-

function markPresent() {
    window.markDate = new Date();
    $(document).ready(function() {
        $("div.absent").toggleClass("present");
    });
    updateClock();
}

function updateClock() {    
    var markMinutes = markDate.getMinutes();
    var markSeconds = markDate.getSeconds();

    var currDate = new Date();
    var currMinutes = currDate.getMinutes();
    var currSeconds = currDate.getSeconds();
    var minutes = currMinutes - markMinutes;
    if(minutes < 0) { minutes += 60; }
    var seconds = currSeconds - markSeconds;
    if(seconds < 0) { seconds += 60; }

    if(minutes < 10) { minutes = "0" + minutes; }
    if(seconds < 10) { seconds = "0" + seconds; }

    var hours = 0;
    if(minutes == 59 && seconds == 59) { hours++; }
    if(hours < 10) { hours = "0" + hours; }

    var timeElapsed = hours+':'+minutes+':'+seconds;
    document.getElementById("timer").innerHTML = timeElapsed;
    setTimeout(function() {updateClock()}, 1000);
}

输出在00:59:59之前是正确的，但在那之后是O / P是：

The output is correct upto 00:59:59 but after that that O/P is:

00:59:59
01:59:59
01:59:00
01:59:01
。
。
。
。
01:59:59
01:00:00

00:59:59 01:59:59 01:59:00 01:59:01 . . . . 01:59:59 01:00:00

我如何解决这个问题，是否有更有效的方法可以做到这一点？
谢谢。

How can I solve this and is there a more efficient way I can do this? Thank you.

推荐答案

这里有太多了。

更简单的方法就是每次将 markDate 与当前日期进行比较并重新格式化。

An easier way would just be to compare markDate to the current date each time and reformat.

参见演示： http://jsfiddle.net/7e4psrzu/

function markPresent() {
    window.markDate = new Date();
    $(document).ready(function() {
        $("div.absent").toggleClass("present");
    });
    updateClock();
}

function updateClock() {  
    var currDate = new Date();
    var diff = currDate - markDate;
    document.getElementById("timer").innerHTML = format(diff/1000);
    setTimeout(function() {updateClock()}, 1000);
}

function format(seconds)
{
var numhours = parseInt(Math.floor(((seconds % 31536000) % 86400) / 3600),10);
var numminutes = parseInt(Math.floor((((seconds % 31536000) % 86400) % 3600) / 60),10);
var numseconds = parseInt((((seconds % 31536000) % 86400) % 3600) % 60,10);
    return ((numhours<10) ? "0" + numhours : numhours)
    + ":" + ((numminutes<10) ? "0" + numminutes : numminutes)
    + ":" + ((numseconds<10) ? "0" + numseconds : numseconds);
}

markPresent();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<div id="timer"></div>

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