日期:2014-05-17 浏览次数:20659 次
?<!DOCTYPE html>
<html> <head> <title></title> <script type="text/javascript"> function draw() { var canvas = document.getElementById("clockCanvas"); var ctx = canvas.getContext("2d"); ctx.clearRect(0, 0, 200, 200); ctx.save(); ctx.translate(100, 100); ctx.font = "Bold 14px Arial"; for (var i = 1; i <=60; i++) { var angle = Math.PI / 30 * i; var sin = Math.sin(angle); var cos = Math.cos(angle); if (i % 5 == 0) { ctx.lineWidth = 4; var sx = sin * 80; var sy = cos * -80; ctx.fillText(i/5, sin * 70-8, cos * -72+5); } else { ctx.lineWidth = 2; var sx = sin * 90; var sy = cos * -90; } var ex = sin * 100; var ey = cos * -100; ctx.beginPath(); ctx.moveTo(sx, sy); ctx.lineTo(ex, ey); ctx.stroke(); } var currentDate = new Date(); var second = currentDate.getSeconds(); var hour = currentDate.getHours(); var minute = currentDate.getMinutes(); ctx.save(); ctx.rotate(Math.PI / 6 * (hour+minute/60+second/3600)); ctx.beginPath(); ctx.moveTo(0, 20); ctx.lineTo(0, -55); ctx.stroke(); ctx.restore(); ctx.save(); ctx.rotate(Math.PI / 30 * (minute + second / 60)); ctx.beginPath(); ctx.moveTo(0, 20); ctx.lineTo(0, -75); ctx.stroke(); ctx.restore(); ctx.rotate(Math.PI / 30 * second); ctx.strokeStyle = "#FF0000"; ctx.beginPath(); ctx.moveTo(0, 20); ctx.lineTo(0, -90); ctx.stroke(); ctx.restore(); setTimeout(draw, 1000) } </script> </head> <body onload="draw()"> <canvas id="clockCanvas" width="200" height="200" style="border:1px solid red"></canvas> </body> </html>?