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    HTML5计时器小例子
    html:

    复制代码
    代码如下:

    <!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="utf-8">
    <!-- Always force latest IE rendering engine (even in intranet) & Chrome Frame
    Remove this if you use the .htaccess -->
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <title>HTML5 Timer for work-relax balance</title>
    <meta name="description" content="">
    <meta name="author" content="kevin">
    <meta name="viewport" content="width=device-width; initial-scale=1.0">
    <!-- Replace favicon.ico & apple-touch-icon.png in the root of your domain and delete these references -->
    <link rel="shortcut icon" href="/favicon.ico"/>
    <link rel="apple-touch-icon" href="/apple-touch-icon.png"/>
    <link rel="stylesheet" type="text/css" href="css/style.css">
    <script>
    countDownSeconds = 60;
    var handle = null;
    //window load
    function onLoadWindow() {
    aCanvas = document.getElementById("countdownCanvas");
    context = aCanvas.getContext("2d");
    var canvasText = "Press to Start...";
    var xPos = aCanvas.width / 2;
    var yPos = aCanvas.height / 2;
    context.font = "12pt Century Gothic";
    context.fillStyle = "#008000;";
    context.textAlign = "center";
    context.textBaseline = "middle";
    context.fillText(canvasText, xPos, yPos);
    }
    function updateCanvas(theContext, width, height) {
    if (countDownSeconds < 0) {
    clearInterval(handle);
    handle = null;
    alert("hey, time is up!");
    return 0;
    }
    minStr = Math.floor(countDownSeconds / 60);
    secStr = countDownSeconds % 60;
    if (minStr < 10) {
    minStr = "0" + minStr;
    }
    if (secStr < 10) {
    secStr = "0" + secStr;
    }
    context.clearRect(0, 0, width, height);
    context.font = "24pt Century Gothic";
    context.fillText(minStr + " : " + secStr, width / 2, height / 2);
    countDownSeconds--;
    }
    function startWorkCountDown() {
    if (handle != null) {
    clearInterval(handle);
    }
    countDownSeconds = document.getElementById("workIntervalInput").value * 60;
    timeDisplayCanvas = document.getElementById("countdownCanvas");
    timeDisplayContext2D = timeDisplayCanvas.getContext("2d");
    updateCanvas(timeDisplayContext2D, timeDisplayCanvas.width, timeDisplayCanvas.height);
    handle = setInterval(function() {
    updateCanvas(timeDisplayContext2D, timeDisplayCanvas.width, timeDisplayCanvas.height);
    }, 1000);
    }
    function startRestCountDown() {
    if (handle != null) {
    clearInterval(handle);
    }
    countDownSeconds = document.getElementById("restIntervalInput").value * 60;
    timeDisplayCanvas = document.getElementById("countdownCanvas");
    timeDisplayContext2D = timeDisplayCanvas.getContext("2d");
    updateCanvas(timeDisplayContext2D, timeDisplayCanvas.width, timeDisplayCanvas.height);
    handle = setInterval(function() {
    updateCanvas(timeDisplayContext2D, timeDisplayCanvas.width, timeDisplayCanvas.height);
    }, 1000);
    }
    </script>
    </head>
    <body onload="onLoadWindow()">
    <div align="center">
    <header>
    <h1>work-life balance timer</h1>
    </header>
    Please choose the work interval:
    <input name="workIntervalInput" id="workIntervalInput" type="number" value="25" min="15" max="45" step="5"/>
    minutes

    Please choose the rest interval:
    <input name="restIntervalInput" id="restIntervalInput" type="number" value="5" min="3" max="10" step="1"/>
    minutes


    <canvas id="countdownCanvas" width="300" height="50" style="border:2px solid black">
    This is a canvas
    </canvas>


    <button onclick="startWorkCountDown()">
    Work Hard
    </button>
    <button onclick="startRestCountDown()">
    Take A Break
    </button>
    <footer>
    <p>
    &copy; Copyright Reserved
    </p>
    </footer>
    </div>
    </body>
    </html>

    css3:

    复制代码
    代码如下:

    /*
    * HTML5 ✰ Boilerplate
    *
    * What follows is the result of much research on cross-browser styling.
    * Credit left inline and big thanks to Nicolas Gallagher, Jonathan Neal,
    * Kroc Camen, and the H5BP dev community and team.
    *
    * Detailed information about this CSS: h5bp.com/css
    *
    * ==|== normalize ==========================================================
    */

    /* =============================================================================
    HTML5 display definitions
    ========================================================================== */
    article, aside, details, figcaption, figure, footer, header, hgroup, nav, section { display: block; }
    header {text-shadow: #220000 0px 0px 10px 10px;}
    audio, canvas, video { display: inline-block; *display: inline; *zoom: 1; }
    audio:not([controls]) { display: none; }
    [hidden] { display: none; }
    /* =============================================================================
    Base
    ========================================================================== */
    /*
    * 1. Correct text resizing oddly in IE6/7 when body font-size is set using em units
    * 2. Force vertical scrollbar in non-IE
    * 3. Prevent iOS text size adjust on device orientation change, without disabling user zoom: h5bp.com/g
    */
    html { font-size: 100%; overflow-y: scroll; -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; }
    body { margin: 0; font-size: 24px; line-height: 1.231;}
    body, button, input, select, textarea {font-family:"Century Gothic"; color:#008000}
    /*
    * Remove text-shadow in selection highlight: h5bp.com/i
    * These selection declarations have to be separate
    * Also: hot pink! (or customize the background color to match your design)
    */
    ::-moz-selection { background: #fe57a1; color: #fff; text-shadow: none; }
    ::selection { background: #fe57a1; color: #fff; text-shadow: none; }

    /* =============================================================================
    Links
    ========================================================================== */
    a { color: #00e; }
    a:visited { color: #551a8b; }
    a:hover { color: #06e; }
    a:focus { outline: thin dotted; }
    /* Improve readability when focused and hovered in all browsers: h5bp.com/h */
    a:hover, a:active { outline: 0; }

    /* =============================================================================
    Typography
    ========================================================================== */
    abbr[title] { border-bottom: 1px dotted; }
    b, strong { font-weight: bold; }
    blockquote { margin: 1em 40px; }
    dfn { font-style: italic; }
    hr { display: block; height: 1px; border: 0; border-top: 1px solid #ccc; margin: 1em 0; padding: 0; }
    ins { background: #ff9; color: #000; text-decoration: none; }
    mark { background: #ff0; color: #000; font-style: italic; font-weight: bold; }
    /* Redeclare monospace font family: h5bp.com/j */
    pre, code, kbd, samp { font-family: monospace, monospace; _font-family: 'courier new', monospace; font-size: 1em; }
    /* Improve readability of pre-formatted text in all browsers */
    pre { white-space: pre; white-space: pre-wrap; word-wrap: break-word; }
    q { quotes: none; }
    q:before, q:after { content: ""; content: none; }
    small { font-size: 85%; }
    /* Position subscript and superscript content without affecting line-height: h5bp.com/k */
    sub, sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline; }
    sup { top: -0.5em; }
    sub { bottom: -0.25em; }

    /* =============================================================================
    Lists
    ========================================================================== */
    ul, ol { margin: 1em 0; padding: 0 0 0 40px; }
    dd { margin: 0 0 0 40px; }
    nav ul, nav ol { list-style: none; list-style-image: none; margin: 0; padding: 0; }

    /* =============================================================================
    Embedded content
    ========================================================================== */
    /*
    * 1. Improve image quality when scaled in IE7: h5bp.com/d
    * 2. Remove the gap between images and borders on image containers: h5bp.com/e
    */
    img { border: 0; -ms-interpolation-mode: bicubic; vertical-align: middle; }
    /*
    * Correct overflow not hidden in IE9
    */
    svg:not(:root) { overflow: hidden; }

    /* =============================================================================
    Figures
    ========================================================================== */
    figure { margin: 0; }

    /* =============================================================================
    Forms
    ========================================================================== */
    form { margin: 0; }
    fieldset { border: 0; margin: 0; padding: 0; }
    /* Indicate that 'label' will shift focus to the associated form element */
    label { cursor: pointer; }
    /*
    * 1. Correct color not inheriting in IE6/7/8/9
    * 2. Correct alignment displayed oddly in IE6/7
    */
    legend { border: 0; *margin-left: -7px; padding: 0; }
    /*
    * 1. Correct font-size not inheriting in all browsers
    * 2. Remove margins in FF3/4 S5 Chrome
    * 3. Define consistent vertical alignment display in all browsers
    */
    button, input, select, textarea { font-size: 100%; margin: 0; vertical-align: baseline; *vertical-align: middle; }
    /*
    * 1. Define line-height as normal to match FF3/4 (set using !important in the UA stylesheet)
    * 2. Correct inner spacing displayed oddly in IE6/7
    */
    button, input { line-height: normal; *overflow: visible; }
    /*
    * Reintroduce inner spacing in 'table' to avoid overlap and whitespace issues in IE6/7
    */
    table button, table input { *overflow: auto; }
    /*
    * 1. Display hand cursor for clickable form elements
    * 2. Allow styling of clickable form elements in iOS
    */
    button, input[type="button"], input[type="reset"], input[type="submit"] { cursor: pointer; -webkit-appearance: button; }
    /*
    * Consistent box sizing and appearance
    */
    input[type="checkbox"], input[type="radio"] { box-sizing: border-box; }
    input[type="search"] { -webkit-appearance: textfield; -moz-box-sizing: content-box; -webkit-box-sizing: content-box; box-sizing: content-box; }
    input[type="search"]::-webkit-search-decoration { -webkit-appearance: none; }
    /*
    * Remove inner padding and border in FF3/4: h5bp.com/l
    */
    button::-moz-focus-inner, input::-moz-focus-inner { border: 0; padding: 0; }
    /*
    * 1. Remove default vertical scrollbar in IE6/7/8/9
    * 2. Allow only vertical resizing
    */
    textarea { overflow: auto; vertical-align: top; resize: vertical; }
    /* Colors for form validity */
    input:valid, textarea:valid { }
    input:invalid, textarea:invalid { background-color: #f0dddd; }

    /* =============================================================================
    Tables
    ========================================================================== */
    table { border-collapse: collapse; border-spacing: 0; }
    td { vertical-align: top; }

    /* ==|== primary styles =====================================================
    Author:
    ========================================================================== */

    /* ==|== non-semantic helper classes ========================================
    Please define your styles before this section.
    ========================================================================== */
    /* For image replacement */
    .ir { display: block; border: 0; text-indent: -999em; overflow: hidden; background-color: transparent; background-repeat: no-repeat; text-align: left; direction: ltr; }
    .ir br { display: none; }
    /* Hide from both screenreaders and browsers: h5bp.com/u */
    .hidden { display: none !important; visibility: hidden; }
    /* Hide only visually, but have it available for screenreaders: h5bp.com/v */
    .visuallyhidden { border: 0; clip: rect(0 0 0 0); height: 1px; margin: -1px; overflow: hidden; padding: 0; position: absolute; width: 1px; }
    /* Extends the .visuallyhidden class to allow the element to be focusable when navigated to via the keyboard: h5bp.com/p */
    .visuallyhidden.focusable:active, .visuallyhidden.focusable:focus { clip: auto; height: auto; margin: 0; overflow: visible; position: static; width: auto; }
    /* Hide visually and from screenreaders, but maintain layout */
    .invisible { visibility: hidden; }
    /* Contain floats: h5bp.com/q */
    .clearfix:before, .clearfix:after { content: ""; display: table; }
    .clearfix:after { clear: both; }
    .clearfix { zoom: 1; }

    /* ==|== media queries ======================================================
    PLACEHOLDER Media Queries for Responsive Design.
    These override the primary ('mobile first') styles
    Modify as content requires.
    ========================================================================== */
    @media only screen and (min-width: 480px) {
    /* Style adjustments for viewports 480px and over go here */
    }
    @media only screen and (min-width: 768px) {
    /* Style adjustments for viewports 768px and over go here */
    }

    /* ==|== print styles =======================================================
    Print styles.
    Inlined to avoid required HTTP connection: h5bp.com/r
    ========================================================================== */
    @media print {
    * { background: transparent !important; color: black !important; text-shadow: none !important; filter:none !important; -ms-filter: none !important; } /* Black prints faster: h5bp.com/s */
    a, a:visited { text-decoration: underline; }
    a[href]:after { content: " (" attr(href) ")"; }
    abbr[title]:after { content: " (" attr(title) ")"; }
    .ir a:after, a[href^="javascript:"]:after, a[href^="#"]:after { content: ""; } /* Don't show links for images, or javascript/internal links */
    pre, blockquote { border: 1px solid #999; page-break-inside: avoid; }
    thead { display: table-header-group; } /* h5bp.com/t */
    tr, img { page-break-inside: avoid; }
    img { max-width: 100% !important; }
    @page { margin: 0.5cm; }
    p, h2, h3 { orphans: 3; widows: 3; }
    h2, h3 { page-break-after: avoid; }
    }
    #startTimer{
    position:inherit
    width:75px;
    height:20px;
    top:35px;
    left:25px;
    cursor:pointer
    }
    #stopTimer{
    position:inherit;
    width:75px;
    height:20px;
    top:10px;
    left:25px;
    cursor:pointer
    }
    #countdownCanvas{
    border-radius:25px;
    box-shadow:10px 10px 5px #888888;
    }
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