var clock=document.getElementById("clock")
var cxt=clock.getContext("2d")
function drawNow(){
var now=new Date()
var hour=now.getHours()
var min=now.getMinutes()
var sec=now.getSeconds()
hour=hour>12?hour-12:hour
hour=hour+min/60
//表盘(蓝色)
cxt.lineWidth=10
cxt.strokeStyle="blue"
cxt.beginPath()
cxt.arc(250,250,200,0,360,false)
cxt.closePath()
cxt.stroke()
//刻度
//时刻度
for(var i=0i<12i++){
cxt.save()
cxt.lineWidth=7
cxt.strokeStyle="black"
cxt.translate(250,250)
cxt.rotate(i*30*Math.PI/180)//旋转角度 角度*Math.PI/180=弧度
cxt.beginPath()
cxt.moveTo(0,-170)
cxt.lineTo(0,-190)
cxt.closePath()
cxt.stroke()
cxt.restore()
}
//分刻度
for(var i=0i<60i++){
cxt.save()
//设置分刻度的粗细
cxt.lineWidth=5
//重置画布原点
cxt.translate(250,250)
//设置旋转角度
cxt.rotate(i*6*Math.PI/180)
//画分针刻度
cxt.strokeStyle="black"
cxt.beginPath()
cxt.moveTo(0,-180)
cxt.lineTo(0,-190)
cxt.closePath()
cxt.stroke()
cxt.restore()
}
//时针
cxt.save()
// 设置时针风格
cxt.lineWidth=7
cxt.strokeStyle="black"
cxt.translate(250,250)
cxt.rotate(hour*30*Math.PI/180)
cxt.beginPath()
cxt.moveTo(0,-140)
cxt.lineTo(0,10)
cxt.closePath()
cxt.stroke()
cxt.restore()
//分针
cxt.save()
cxt.lineWidth=5
cxt.strokeStyle="black"
//设置异次元空间分针画布的中心
cxt.translate(250,250)
cxt.rotate(min*6*Math.PI/180)
cxt.beginPath()
cxt.moveTo(0,-160)
cxt.lineTo(0,15)
cxt.closePath()
cxt.stroke()
cxt.restore()
//秒针
cxt.save()
//设置秒针的风格
//颜色:红色
cxt.strokeStyle="red"
cxt.lineWidth=3
//重置原点
cxt.translate(250,250)
//设置角度
//cxt.rotate(330*Math.PI/180)
cxt.rotate(sec*6*Math.PI/180)
cxt.beginPath()
cxt.moveTo(0,-170)
cxt.lineTo(0,20)
cxt.closePath()
cxt.stroke()
//画出时针,分针,秒针的交叉点
cxt.beginPath()
cxt.arc(0,0,5,0,360,false)
cxt.closePath()
//设置填充
cxt.fillStyle="gray"
cxt.fill()
//cxt.strokeStyle="red"
cxt.stroke()
//画出秒针的小圆点
cxt.beginPath()
cxt.arc(0,-140,5,0,360,false)
cxt.closePath()
//设置填充
cxt.fillStyle="gray"
cxt.fill()
//cxt.strokeStyle="red"
cxt.stroke()</p>
<p> cxt.restore()</p>
<p>}
function drawClock(){
cxt.clearRect(0,0,500,500)
drawNow()
}
drawNow()
setInterval(drawClock,1000)
zhidao.baidu.www.cnblogs.com<!DOCTYPE>
<html lang="zh-CN">
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=utf-8" />
<title>表盘</title>
</head>
<style type="text/css">
html,body,div,canvas,a{margin: 0pxpadding: 0px}
html,body{width: 100%height: 100%}
body{background: rgba(128,255,0,128)}