mmmturkeybacon Floating Timers

Adds total time elapsed, time remaining, and task time elapsed to a floating display. The task timer keeps track of page load times to more accurately reflect the amount of required to finish a HIT.
当前为 2015-02-04 提交的版本，查看最新版本。
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// ==UserScript==
// @name        mmmturkeybacon Floating Timers
// @author      mmmturkeybacon
// @description Adds total time elapsed, time remaining, and task time elapsed to a floating display. The task timer keeps track of page load times to more accurately reflect the amount of required to finish a HIT.
// @namespace   http://userscripts.org/users/523367
// @match       https://*.mturk.com/mturk/preview*
// @match       https://*.mturk.com/mturk/accept*
// @match       https://*.mturk.com/mturk/continue*
// @match       https://*.mturk.com/mturk/submit*
// @match       https://*.mturk.com/mturk/return*
// @require     http://code.jquery.com/jquery-latest.min.js
// @version     1.04
// @grant       none
// ==/UserScript==

/* Code for calculating time remaining modified from mTurk Title Bar Timer (http://userscripts-mirror.org/scripts/review/169153)
 * The offset calculation is much more simplistic than https://www.mturk.com/js/timer.js uses but it is probably sufficient. */

// try to get serverTimestamp and set offset immediately, if that fails try again when the document is ready.
var offset;
var serverTimestamp = unsafeWindow.serverTimestamp;
if (serverTimestamp)
{
    offset = (new Date()).getTime() - serverTimestamp;
}

/* Set task_start_time as soon as possible, because page load time affects how long it takes to complete
 * a task. */
var task_start_time = localStorage.getItem('mtb_page_unload_time');
if (task_start_time == null)
{
    task_start_time = (new Date()).getTime();
}

//$(document).ready(function()
window.addEventListener('load', function()
{
    if (offset)
    {
        serverTimestamp = unsafeWindow.serverTimestamp;
        if (serverTimestamp)
        {
            offset = (new Date()).getTime() - serverTimestamp;
        }
    }

    var endTime = unsafeWindow.endTime;
    if (endTime)
    {
        endTime = endTime.getTime();
    }

    var timer_holder = document.createElement("DIV");
    timer_holder.style = "position: fixed; top: 0px; left: 0px; z-index: 20; background-color: black;";
    timer_holder.align = "right";

    var timer_holder_innerHTML = '<div><span id="elapsed_timer" style="font-size: 14px; color: white; font-family: verdana,arial,sans-serif; text-align: right;"></span></div>';
    timer_holder_innerHTML += '<div><span id="remaining_timer" style="font-size: 14px; color: white; font-family: verdana,arial,sans-serif; text-align: right;"></span></div>';
    timer_holder_innerHTML += '<div><span id="task_timer" style="font-size: 14px; color: white; font-family: verdana,arial,sans-serif; text-align: right;"></span></div>';

    timer_holder.innerHTML = timer_holder_innerHTML;

    document.body.insertBefore(timer_holder, document.body.firstChild);

    var theTime = document.getElementById("theTime");
    var elapsed_timer = document.getElementById("elapsed_timer");
    var remaining_timer = document.getElementById("remaining_timer");
    var task_timer = document.getElementById("task_timer");

    var observer = new MutationObserver(function (mutations)
    {
        var now = (new Date()).getTime();

        elapsed_timer.innerHTML = theTime.innerHTML;

        var task_seconds_elapsed = Math.floor((now - task_start_time)/1000);
        task_timer.innerHTML = format_time(task_seconds_elapsed);

        if (endTime && offset)
        {
            var seconds_remaining = Math.floor((endTime - (now + offset))/1000);
            remaining_timer.innerHTML = format_time(seconds_remaining);
        }
        else
        {
            remaining_timer.innerHTML = "error";
        }

    });
    var options = {
      subtree: true,
      childList: true,
      attributes: false
    };

    observer.observe(theTime, options);

    window.addEventListener('beforeunload', function(){if(typeof(Storage)!=="undefined"){localStorage.setItem('mtb_page_unload_time', (new Date()).getTime());}});

});


function format_time(time_in_seconds)
{
    var time_str = "error";

    if (time_in_seconds >= 0)
    {
        // time formatting code modified from http://userscripts.org/scripts/show/169154
        var days  = Math.floor((time_in_seconds/(60*60*24)));
        var hours = Math.floor((time_in_seconds/(60*60)) % 24);
        var minutes  = Math.floor((time_in_seconds/60) % 60);
        var seconds  = time_in_seconds % 60;

        time_str = (days == 0 ? '' : days + (days > 1 ? ' days ' : ' day '));

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

        time_str += hours + ':' +minutes + ':' + seconds;
    }

    return time_str;
}
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