js implements round clock-JS Tutorial-php.cn

js implements round clock

韦小宝

Release： 2017-11-22 11:06:04

Original

2623 people have browsed it

jsTo implement a circular clock, you can modify it and put it into our project as a plug-in. Those who are interested in js can also study it. For our jsThe level will be improved~

js implements round clock

Code demonstration:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>PHP中文网</title>
		<style>
		</style>
	</head>
	<body>
		
		<canvas id="can" width="500" height="500">
		</canvas>
		<script>
			var can=document.getElementById("can")
			var ctx=can.getContext("2d")
			
			function click(){
				ctx.clearRect(0,0,500,500)
				/*===========圆====================*/
				ctx.beginPath()
				ctx.lineWidth=10
				ctx.strokeStyle="#ccc"
				ctx.arc(250,250,210,0,Math.PI*2)
				ctx.stroke()
				ctx.closePath()
				
				
				/*==================刻度==================*/
				for(var i=0;i<60;i++){
					ctx.save()
					ctx.translate(250,250)
					ctx.beginPath()
					ctx.rotate(i*6*Math.PI/180)
					ctx.lineWidth=6
					ctx.strokeStyle="#000"
					ctx.moveTo(0,-200)
					ctx.lineTo(0,-180)
					ctx.stroke()
					ctx.closePath()
					ctx.restore()
					
				}
				for(var i=12;i>0;i--){
					ctx.save()
					ctx.beginPath()
					ctx.translate(250,250)
					ctx.rotate(i*30*Math.PI/180)
					ctx.font=&#39;24px 宋体&#39;
					if(i<6){
						ctx.fillText(i,-9,-144)
					}else if(i==6){
						ctx.fillText(9,-9,-144)
					}else if(i<=12){
						ctx.fillText(i,-9,-144)
					}
					ctx.lineWidth=8
					ctx.strokeStyle="#f00"
					ctx.moveTo(0,-200)
					ctx.lineTo(0,-170)
					ctx.stroke()
					ctx.closePath()
					ctx.restore()
					
			    }
				var str=new Date()
				h=str.getHours()
				m=str.getMinutes()
				s=str.getSeconds()
				/*====================数字===============================*/
			
				/*=====================时针===========================*/   
			ctx.save()
			ctx.translate(250,250)
			ctx.beginPath()
			ctx.rotate(h*Math.PI/6)
			ctx.lineWidth=8
			ctx.strokeStyle="purple"
			ctx.moveTo(0,-100)
			ctx.lineTo(0,10)
			ctx.stroke()
			ctx.closePath()
			ctx.restore()
			/*=====================分针===========================*/
			ctx.save()
			ctx.translate(250,250)
			ctx.beginPath()
			ctx.rotate(m*Math.PI/30)
			ctx.lineWidth=6
			ctx.strokeStyle="gold"
			ctx.moveTo(0,-120)
			ctx.lineTo(0,10)
			ctx.stroke()
			ctx.closePath()
			ctx.restore()
			/*=====================秒针===========================*/
			ctx.save()
			ctx.translate(250,250)
			ctx.beginPath()
			ctx.rotate(s*6*Math.PI/180)
			ctx.lineWidth=4
			ctx.strokeStyle="greenyellow"
			ctx.moveTo(0,-140)
			ctx.lineTo(0,10)
			ctx.stroke()
			ctx.closePath()
			ctx.restore()
			}
			setInterval(click,1000)
		</script>
	</body>
</html>

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