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()"> <p 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> </p> </body> </html>
css3:
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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