HTML5计时器实现方法

百变鹏仔 2个月前 (10-18) #H5教程

文章标签计时器

听到计时器之后或许大家认为只有在js中可以实现，其实这种想法在你不知道有html5的情况下还能成立，下文为大家介绍下html5中是如何实现计时器的，感兴趣的朋友不要错过

html:

<!DOCTYPE html> <html> <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> <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:

/* * 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: &#39;courier new&#39;, 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 &#39;label&#39; 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 &#39;table&#39; 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 (&#39;mobile first&#39;) 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&#39;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; }

文章推荐

HTML5计时器实现方法

HTML在线编辑器的调用方法和使用方法

AlloyTouch全屏滚动插件 30秒搞定顺滑H5页

HTML5 js实现拖拉上传文件功能

Canvas and Drawables 翻译第一集

Canvas and Drawables 翻译第三集