今天小编跟大家讲解下有关HTML5计时器小例子 ，相信小伙伴们对这个话题应该有所关注吧，小编也收集到了有关HTML5计时器小例子 的相关资料，希望小伙伴们看了有所帮助。
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="https://www.aidi.net.cn/favicon.ico"/> <link rel="apple-touch-icon"href="https://www.aidi.net.cn/apple-touch-icon.png"/> <link rel="stylesheet"type="text/css"href="https://www.aidi.net.cn//html5/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> © Copyright Reserved </p> </footer> </div> </body> </html> css3: 复制代码代码如下: 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; } 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} ::-moz-selection { background: #fe57a1; color: #fff; text-shadow: none; } ::selection { background: #fe57a1; color: #fff; text-shadow: none; } a { color: #00e; } a:visited { color: #551a8b; } a:hover { color: #06e; } a:focus { outline: thin dotted; } a:hover, a:active { outline: 0; } 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; } pre, code, kbd, samp { font-family: monospace, monospace; _font-family: 'courier new', monospace; font-size: 1em; } 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%; } sub, sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline; } sup { top: -0.5em; } sub { bottom: -0.25em; } 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; } img { border: 0; -ms-interpolation-mode: bicubic; vertical-align: middle; } svg:not(:root) { overflow: hidden; } figure { margin: 0; } form { margin: 0; } fieldset { border: 0; margin: 0; padding: 0; } label { cursor: pointer; } legend { border: 0; *margin-left: -7px; padding: 0; } button, input, select, textarea { font-size: 100%; margin: 0; vertical-align: baseline; *vertical-align: middle; } button, input { line-height: normal; *overflow: visible; } table button, table input { *overflow: auto; } button, input[type="button"], input[type="reset"], input[type="submit"] { cursor: pointer; -webkit-appearance: button; } 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; } button::-moz-focus-inner, input::-moz-focus-inner { border: 0; padding: 0; } textarea { overflow: auto; vertical-align: top; resize: vertical; } input:valid, textarea:valid { } input:invalid, textarea:invalid { background-color: #f0dddd; } table { border-collapse: collapse; border-spacing: 0; } td { vertical-align: top; } .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; } .hidden { display: none !important; visibility: hidden; } .visuallyhidden { border: 0; clip: rect(0 0 0 0); height: 1px; margin: -1px; overflow: hidden; padding: 0; position: absolute; width: 1px; } .visuallyhidden.focusable:active, .visuallyhidden.focusable:focus { clip: auto; height: auto; margin: 0; overflow: visible; position: static; width: auto; } .invisible { visibility: hidden; } .clearfix:before, .clearfix:after { content:""; display: table; } .clearfix:after { clear: both; } .clearfix { zoom: 1; } @media only screen and (min-width: 480px) { } @media only screen and (min-width: 768px) { } @media print { * { background: transparent !important; color: black !important; text-shadow: none !important; filter:none !important; -ms-filter: none !important; } 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:""; } pre, blockquote { border: 1px solid #999; page-break-inside: avoid; } thead { display: table-header-group; } 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; }来源：爱蒂网
