html版电子表，秒表，倒计时

电子表：

<button onclick="fullscreen()">全屏切换</button><button onclick="fontsizeup()">变大</button><button onclick="fontsizedown()">变小</button><button onclick="fontsizereset()">恢复</button><div style="margin:0 auto; text-align:center"><div style="font-size:48px; color: blue;" id="date"><span id="year">2017</span>-<span id="month">01</span>-<span id="day">01</span></div><div style="font-size:140px; color: blue;" id="time"><span id="h">12</span>:<span id="m">00</span>:<span id="s">00</span>.<span id="sss">000</span></div></div><script>var bfullscreen = false;function fullscreen() {//document.documentElement.webkitRequestFullScreen();//var docElm = document.documentElement;//console.log(docElm)if (!bfullscreen) {if (document.requestFullscreen) { // w3cdocument.requestFullscreen();} else if (document.mozRequestFullScreen) { // FireFoxdocument.mozRequestFullScreen();} else if (document.webkitRequestFullScreen) { // chromedocument.webkitRequestFullScreen();  } else if (document.msRequestFullscreen) { // IE11document.msRequestFullscreen();}bfullscreen = true;} else {if (document.exitFullscreen) {    document.exitFullscreen();} else if (document.mozCancelFullScreen) {    document.mozCancelFullScreen();} else if (document.webkitCancelFullScreen) {    document.webkitCancelFullScreen();} else if (document.msExitFullscreen) {      document.msExitFullscreen();}bfullscreen = false;}}function fontsizereset() {var ed = document.getElementById("date");var et = document.getElementById("time");ed.style.fontSize = "48px";et.style.fontSize = "160px";}function fontsizeup() {var ed = document.getElementById("date");var et = document.getElementById("time");var vd = ed.style.fontSize;var vt = et.style.fontSize;vd = parseInt(vd.substring(0, vd.length - 2)) + 16;vt = parseInt(vt.substring(0, vt.length - 2)) + 24;if (vd > 240)vd = 240;if (vt > 360)vt = 360;ed.style.fontSize = vd + "px";et.style.fontSize = vt + "px";}function fontsizedown() {var ed = document.getElementById("date");var et = document.getElementById("time");var vd = ed.style.fontSize;var vt = et.style.fontSize;vd = parseInt(vd.substring(0, vd.length - 2)) - 20;vt = parseInt(vt.substring(0, vt.length - 2)) - 20;if (vd < 12)vd = 12;if (vt < 16)vt = 16;ed.style.fontSize = vd + "px";et.style.fontSize = vt + "px";}// -------------------------------function updateDate(y, m, d) {if (m < 10)m = "0" + m;if (d < 10)d = "0" + d;document.getElementById("year").innerHTML = y;document.getElementById("month").innerHTML = m;document.getElementById("day").innerHTML = d;}function updateTime(h, m, s, sss) {if (h < 10)h = "0" + h;if (m < 10)m = "0" + m;if (s < 10)s = "0" + s;document.getElementById("h").innerHTML = h;document.getElementById("m").innerHTML = m;document.getElementById("s").innerHTML = s;document.getElementById("sss").innerHTML = sss;}function update(){var date = new Date();updateDate(date.getFullYear(), date.getMonth() + 1, date.getDate());updateTime(date.getHours(), date.getMinutes(), date.getSeconds(), parseInt(date.getMilliseconds() / 100));};setInterval("update()",100); // 用延时的话间隔1s多1ms</script>

秒表：

<button onclick="start()">开始</button><button onclick="stop()">停止</button><button onclick="record()">记录</button><button onclick="clean()">清空</button><div style="margin:0 auto; text-align:center; height: 400px;"><div style="font-size:140px; color: blue;" id="time"><span id="h">00</span>:<span id="m">00</span>:<span id="s">00</span>.<span id="sss">000</span></div><pre id="result"></pre></div><script>// -------------------------------function updateTime(h, m, s, sss) {if (h < 10)h = "0" + h;if (m < 10)m = "0" + m;if (s < 10)s = "0" + s;if (sss < 10)sss = "00" + sss;else if (sss < 100)sss = "0" + sss;document.getElementById("h").innerHTML = h;document.getElementById("m").innerHTML = m;document.getElementById("s").innerHTML = s;document.getElementById("sss").innerHTML = sss;}var _time = new Date().getTime();function update(){var time = new Date().getTime() - _time;console.log(time);var ms = time % 1000;time = (time - ms) / 1000;var s = time % 60;time = (time - s) / 60;var m = time % 60;time = (time - m) / 60;var h = time % 60;time = (time - h) / 60;updateTime(h, m, s, ms);};var interval = null;function start() {if (interval != null) return;var h = document.getElementById("h").innerHTML;var m = document.getElementById("m").innerHTML;var s = document.getElementById("s").innerHTML;var sss = document.getElementById("sss").innerHTML;//console.log("" + parseInt(sss) +"-"+ parseInt(s) + "-" + parseInt(m)  + "-" + parseInt(h));var time = parseInt(sss) + parseInt(s) * 1000 + parseInt(m) * 60000 + parseInt(h) * 3600000;//console.log("time=" + time);_time = new Date().getTime() - time;interval = setInterval("update()",1); // 用延时的话间隔1s多1ms}function stop() {if (interval == null) return;clearInterval(interval);interval = null;}function record() {var e = document.getElementById("result");var t = e.innerHTML;var h = document.getElementById("h").innerHTML;var m = document.getElementById("m").innerHTML;var s = document.getElementById("s").innerHTML;var sss = document.getElementById("sss").innerHTML;e.innerHTML = t + "\n" + h +":"+ m +":"+ s +"."+ sss;}function clean() {_time = new Date().getTime();update();document.getElementById("result").innerHTML = "";}</script>

倒计时：

<button onclick="start()">开始</button><button onclick="stop()">停止</button><button onclick="clean()">清空</button><div style="margin:0 auto; text-align:center" id="main"><div style="font-size:24px;" id="timeset"><input type="number" id="hh" min="0" max="23" value="0"> :<input type="number" id="mm" min="0" max="59" value="0"> :<input type="number" id="ss" min="0" max="59" value="30"> .<input type="number" id="ssss" min="0" max="999" value="0"><button onclick="set()">设置定时</button></div><div style="font-size:140px; color: blue;" id="time"><span id="h">00</span>:<span id="m">00</span>:<span id="s">00</span>.<span id="sss">000</span></div><pre id="result"></pre></div><script>function set() {var h = document.getElementById("hh").value;var m = document.getElementById("mm").value;var s = document.getElementById("ss").value;var sss = document.getElementById("ssss").value;h = parseInt(h);m = parseInt(m);s = parseInt(s);sss = parseInt(sss);updateTime(h, m, s, sss);}// -------------------------------function updateTime(h, m, s, sss) {if (h < 10)h = "0" + h;if (m < 10)m = "0" + m;if (s < 10)s = "0" + s;if (sss < 10)sss = "00" + sss;else if (sss < 100)sss = "0" + sss;document.getElementById("h").innerHTML = h;document.getElementById("m").innerHTML = m;document.getElementById("s").innerHTML = s;document.getElementById("sss").innerHTML = sss;}var _time = new Date().getTime();function update(){var time = _time - new Date().getTime();var end = false;if (time <= 0) {time = 0;end = true;}//console.log(time);var ms = time % 1000;time = (time - ms) / 1000;var s = time % 60;time = (time - s) / 60;var m = time % 60;time = (time - m) / 60;var h = time % 60;time = (time - h) / 60;updateTime(h, m, s, ms);if (end) {stop();warn();return;}};var interval = null;function start() {if (interval != null) return;var h = document.getElementById("h").innerHTML;var m = document.getElementById("m").innerHTML;var s = document.getElementById("s").innerHTML;var sss = document.getElementById("sss").innerHTML;//console.log("" + parseInt(sss) +"-"+ parseInt(s) + "-" + parseInt(m)  + "-" + parseInt(h));var time = parseInt(sss) + parseInt(s) * 1000 + parseInt(m) * 60000 + parseInt(h) * 3600000;//console.log("time=" + time);_time = new Date().getTime() + time;//console.log(_time);document.getElementById("time").style.backgroundColor = "#fff";interval = setInterval("update()", 1);}function stop() {document.getElementById("time").style.backgroundColor = "#fff";if (interval == null) return;clearInterval(interval);interval = null;}function clean() {stop();_time = new Date().getTime();updateTime(0,0,0,0);}function warn() {console.log("wann, end");document.getElementById("time").style.backgroundColor = "red";//alert("到时间了");}</script>