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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>canvas clock</title> <style type="text/css"> div{text-align:center;margin-top:250px;} </style> </head> <body> <div> <canvas id="clock" width="300" height="300">您的浏览器不支持canvas</canvas> </div> <script type="text/javascript"> window.οnlοad=function(){ var c=document.getElementById("clock"); var ctx=c.getContext('2d'); var width=ctx.canvas.width; var height=ctx.canvas.width; var r=width/2; var rem=width/200; function drawBackground(){ ctx.save(); ctx.translate(r,r); ctx.beginPath(); ctx.lineWidth=10*rem; ctx.arc(0,0,r-ctx.lineWidth/2,0,2*Math.PI); ctx.stroke(); var hourNumbers=[3,4,5,6,7,8,9,10,11,12,1,2]; ctx.font=18*rem+"px Arial"; ctx.textAlign="center"; ctx.textBaseline="middle"; hourNumbers.forEach(function(number,i){ var rad=2*Math.PI/12*i; var x=Math.cos(rad)*(r-30*rem); var y=Math.sin(rad)*(r-30*rem); ctx.fillText(number,x,y); }) for(var i=0;i<60;i++){ var rad=2*Math.PI/60*i; var x=Math.cos(rad)*(r-15*rem); var y=Math.sin(rad)*(r-15*rem); ctx.beginPath(); if(i%5==0){ ctx.fillStyle='#000'; ctx.arc(x,y,2*rem,0,2*Math.PI) } else{ ctx.fillStyle='#ccc'; ctx.arc(x,y,2*rem,0,2*Math.PI) } ctx.fill(); } } function drawHour(hour,minute){ ctx.save(); ctx.beginPath(); var rad=2*Math.PI/12*hour; var mrad=2*Math.PI/12/60*minute; ctx.rotate(rad+mrad); ctx.lineWidth=6*rem; ctx.lineCap='round'; ctx.moveTo(0,10*rem); ctx.lineTo(0,-r/2); ctx.stroke(); ctx.restore() } function drawMinute(minute){ ctx.save(); ctx.beginPath(); var rad=2*Math.PI/60*minute; ctx.rotate(rad); ctx.lineWidth=3*rem; ctx.lineCap='round'; ctx.moveTo(0,10*rem); ctx.lineTo(0,-r+35*rem); ctx.stroke(); ctx.restore() } function drawSecond(second){ ctx.save(); ctx.beginPath(); ctx.fillStyle='#c14543'; var rad=2*Math.PI/60*second; ctx.rotate(rad); ctx.moveTo(-2*rem,20*rem); ctx.lineTo(2*rem,20*rem); ctx.lineTo(1,-r+18*rem); ctx.lineTo(-1,-r+18*rem); ctx.fill(); ctx.restore() } function drawDot(){ ctx.beginPath(); ctx.fillStyle='#fff'; ctx.arc(0,0,3*rem,0,2*Math.PI); ctx.fill(); } function draw(){ ctx.clearRect(0,0,width,height) var now=new Date(); var hour=now.getHours(); var minute=now.getMinutes(); var second=now.getSeconds(); drawBackground(); drawHour(hour,minute); drawMinute(minute); drawSecond(second); drawDot(); ctx.restore(); } draw(); setInterval(draw,1000) } </script> </body> </html>2：
<!DOCTYPE html> <html> <head> <title>Js版带表盘的时钟</title> <meta charset="utf-8"/> <style type="text/css"> #clock{width:100px; height:100px; border-radius:50%; border:2px solid black; position:relative; } #s{width:2px; height:55px; position:absolute; top:5px; left:49px; background-color:red; transform-origin:50% 45px; } #m{width:4px; height:50px; position:absolute; top:10px; left:48px; background-color:black; transform-origin:50% 40px; } #h{width:6px; height:45px; position:absolute; top:15px; left:47px; background-color:black; transform-origin:50% 35px; } div[id^="a"]{position:absolute; font-size:.5em; text-align:center; width:7px; height:5px; top:0; left: 46.5px; transform-origin:50% 50px; } #a4,#a8{font-size:.4em; font-weight:bold} #a1{transform:rotate(30deg)} #a2{transform:rotate(60deg)} #a3{transform:rotate(90deg)} #a4{transform:rotate(120deg)} #a5{transform:rotate(150deg)} #a6{transform:rotate(180deg)} #a7{transform:rotate(210deg)} #a8{transform:rotate(240deg)} #a9{transform:rotate(270deg)} #a10{transform:rotate(300deg)} #a11{transform:rotate(330deg)} </style> </head> <body> <div id="clock"> <div id="h"></div> <div id="m"></div> <div id="s"></div> <div id="a1">I</div> <div id="a2">II</div> <div id="a3">III</div> <div id="a4">IIII</div> <div id="a5">V</div> <div id="a6">VI</div> <div id="a7">VII</div> <div id="a8">VIII</div> <div id="a9">IX</div> <div id="a10">X</div> <div id="a11">XI</div> <div id="a12">XII</div> </div> <script> //找到id为h的div，保存在divH中 //找到id为m的div，保存在divM中 //找到id为s的div，保存在divS中 var divH=document.getElementById("h"); var divM=document.getElementById("m"); var divS=document.getElementById("s"); function task(){ var now=new Date();//获得当前时间now var s=now.getSeconds();//获得当前的s var m=now.getMinutes();//获得当前的m var h=now.getHours();//获得当前的h h>=12&&(h-=12);//如果h>=12，就改为h-12 var sDeg=s/60*360;//计算s的角度sDeg var mDeg=(m*60+s)/3600*360;//计算m的角度mDeg //计算h的角度hDeg var hDeg=(h*3600+m*60+s)/(3600*12)*360; //设置divS的transform属性为rotate(sDegdeg) //设置divM的transform属性为rotate(mDegdeg) //设置divH的transform属性为rotate(hDegdeg) divS.style.transform="rotate("+sDeg+"deg)"; divM.style.transform="rotate("+mDeg+"deg)"; divH.style.transform="rotate("+hDeg+"deg)"; } task(); setInterval(task,1000); </script> </body> </html>