js代码
var canvas = document.getelementbyid(clock); var clock = canvas.getcontext(2d); function zhong() { clock.save(); //开始画外层圆 clock.translate(200, 200); clock.strokestyle = 'black'; clock.linewidth = 3; clock.beginpath(); clock.arc(0, 0, 195, 0, 2 * math.pi); clock.stroke(); //时钟上的数字 var shuzi = [3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2]; clock.font = 30px arial; clock.textalign = center; clock.textbaseline = middle; shuzi.foreach(function(number, i) { var rad = 2 * math.pi / 12 * i; var x = math.cos(rad) * 180; var y = math.sin(rad) * 180; clock.filltext(number, x, y); }); // 小圆点 for(j = 0; j < 60; j++) { var h = 2 * math.pi / 60 * j; var m = math.cos(h) * 180; var n = math.sin(h) * 180; clock.fillstyle = 'black'; clock.beginpath(); if(j % 5 === 0) { continue; } clock.arc(m, n, 3, 0, 2 * math.pi); clock.fill(); } } function drawhour(hour,min) { clock.save(); var rad = 2 * math.pi / 12 * hour; var red = 2 *math.pi/12/60*min; clock.rotate(rad+red); clock.linewidth = 10; clock.linecap = round; clock.beginpath(); clock.moveto(0, 5); clock.lineto(0, -100); clock.stroke(); clock.restore(); } function drawmin(min) { clock.save(); var rad = 2 * math.pi / 60 * min; clock.rotate(rad); clock.linewidth = 5; clock.linecap = round; clock.beginpath(); clock.moveto(0, 10); clock.lineto(0, -150); clock.stroke(); clock.restore(); } function drawsec(sec) { clock.save(); var rad = 2 * math.pi / 60 * sec; clock.rotate(rad); clock.linewidth = 2; clock.linecap = round; clock.strokestyle = red; clock.beginpath(); clock.moveto(0, 10); clock.lineto(0, -180); clock.stroke(); clock.restore(); } function dian() { clock.fillstyle = white; clock.beginpath(); clock.arc(0, 0, 2, 0, 2 * math.pi); clock.fill(); } function xuanzhuan() { clock.clearrect(0,0,400,400); zhong(); var now = new date(); var hour = now.gethours(); var min = now.getminutes(); var sec = now.getseconds(); drawhour(hour,min); drawmin(min); drawsec(sec); dian(); clock.restore(); } xuanzhuan(); setinterval(xuanzhuan, 1000);
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