通过 Chrome 让 JQuery 秒表在后台运行

Question

我用 JQuery 制作了一个秒表，最初是为了我的网站，然后出于各种原因，我希望它成为一个 chrome 扩展。无论如何，它运行良好，除了一个问题。你启动它，然后一旦弹出窗口关闭它就会停止，我很难弄清楚如何解决这个问题。

你可以在这里下载源代码 - http://officialspeed.tk/timesamurai/chrome/stopwatch.zip

清单

{
    "name": "TimeSamurai",
    "version": "1.0.2",
    "description": "A very simple stopwatch with a very nice oriental theme added to it.",

    "browser_action": {
        "default_icon": "images/32x32.png",
        "default_title": "TimeSamurai",
        "background_page": "background.html",
        "popup": "popup.html"
   },

    "icons": {
        "16": "images/16x16.png",
        "32": "images/32x32.png",
        "48": "images/48x48.png"
   }
}

style.css

body {
    min-width:350px;
    min-height:200px;
    background-color:black;
    background-image:url('images/bg.jpg');
    background-position:top left;
    background-attachment:scroll;
    background-repeat:repeat;}

.display {
    position:absolute;
    top:25px;
    left:50%;
    margin-left:-33px;
    font-size:18;
    font-family:times new roman;
    font-weight:bold;
    color:FFFFFF;
    z-index:1;}

.base {
    position:absolute;
    top: 50%;
    left: 50%;
    margin-left: -117px;
    margin-top: -50px;
    width:235px;}

.start {
    position:absolute;
    top:3px;
    left:50%;
    margin-left:-115px;
    width:65px;
    height:33px;
    border:0px;
    background-color:transparent;
    background-image:url('images/start.png');}

.start:hover {
    width:65px;
    height:33px;
    color:transparent;
    border:0px;
    background-color:transparent;
    background-image:url('images/starthover.png');}

.stop {
    position:absolute;
    top:3px;
    left:50%;
    margin-left:-115px;
    width:65px;
    height:33px;
    border:0px;
    background-color:transparent;
    background-image:url('images/stop.png');}

.stop:hover {
    width:65px;
    height:33px;
    color:transparent;
    border:0px;
    background-color:transparent;
    background-image:url('images/stophover.png');}

.reset {
    position:absolute;
    top:35px;
    left:50%;
    margin-left:-115px;
    width:65px;
    height:32px;
    border:0px;
    background-color:transparent;
    background-image:url('images/reset.png');}

.reset:hover {
    width:65px;
    height:32px;
    color:transparent;
    border:0px;
    background-color:transparent;
    background-image:url('images/resethover.png');}

background.html

<link rel="stylesheet" href="style.css" />
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
(function($) {
    jQuery.fn.stopwatch = function() {
        var clock = $(this);
        var timer = 0;

        clock.addClass('stopwatch');

        // We have to do some searching, so we'll do it here, so we only have to do it once.
        var h = clock.find('.hr');
        var m = clock.find('.min');
        var s = clock.find('.sec');
        var milli = clock.find('.mil');
        var start = clock.find('.start');
        var stop = clock.find('.stop');
        var reset = clock.find('.reset')

        stop.hide();

        start.bind('click', function() {
            timer = setInterval(do_time, 15);
            stop.show();
            start.hide();
        });

        stop.bind('click', function() {
            clearInterval(timer);
            timer = 0;
            start.show();
            stop.hide();
        });

        reset.bind('click', function() {
            clearInterval(timer);
            timer = 0;
            h.html("00");
            m.html("00");
            s.html("00");
            milli.html("00");
            stop.hide();
            start.show();
        });

        function do_time() {
            // parseInt() doesn't work here...
            hour = parseFloat(h.text());
            minute = parseFloat(m.text());
            second = parseFloat(s.text());
            millisecond = parseFloat(milli.text());

            millisecond++;

            if(millisecond > 59) {
                millisecond = 0;
                second = second + 1;
            }
            if(second > 59) {
                second = 0;
                minute = minute + 1;
            }
            if(minute > 59) {
                minute = 0;
                hour = hour + 1;
            }

            h.html("0".substring(hour >= 10) + hour);
            m.html("0".substring(minute >= 10) + minute);
            s.html("0".substring(second >= 10) + second);
            milli.html("0".substring(millisecond >= 10) + millisecond);
        }
    }
})(jQuery);

$(function() {
    $('#timer').stopwatch();
});
</script>

popup.html

<html>
<head>
<link rel="stylesheet" href="style.css" />
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
    chrome.extension.getBackgroundPage();
</script>
</head>
<body>
    <div class="base">
        <img src="images/base.png">
        <div id="timer"></div>
    </div>
</body>
</html>

Answer 1

我猜你需要background page。

扩展的一个常见需求是 有一个长时间运行的脚本 管理一些任务或状态。背景 救援页面。

在您的扩展程序中，您将使用背景页面来存储和管理秒表的当前状态，并使用弹出页面来显示任何 UI/进度。

脚本之间有多种通信方式。您可以使用message passing 在您的popup.html/background.html 之间进行对话，也可以使用chrome.extension.getBackgroundPage() 返回背景页面的dom 窗口对象。