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JS+H5 Canvas实现时钟效果

程序员文章站 2023-09-02 15:47:37
用javascript+canvas来实现最简单的时钟效果,供大家参考,具体内容如下 效果图: 先看html代码: <...

用javascript+canvas来实现最简单的时钟效果,供大家参考,具体内容如下

效果图:

JS+H5 Canvas实现时钟效果

先看html代码:

<html>
 <head>
 <meta charset="utf-8">
 <title></title>
 <script type="text/javascript" src="js/demo3.js" ></script>
 </head>
  <body>
 <canvas id = "canvas"></canvas>
  </body>
</html>

javascript代码:

var canvas,context;
function draw(){//定义划时钟的方法
 var data = new date();
 var hhoure = data.gethours();
 var mmin = data.getminutes();
 var ssec = data.getseconds();
 var hvalue = (hhoure*30+mmin/2-90)*math.pi/180; 
 var mvalue = (mmin*6-90)*math.pi/180;
 var svalue = (ssec*6 -90)*math.pi/180;
 var x = 200,y = 200,r = 150;
 
 context.clearrect(0,0,canvas.width,canvas.height);
 context.moveto(x,y);
 context.arc(x,y,r,0,6*math.pi/180,false);
 //
 context.beginpath();
 context.linewidth = 1;
 for(var i = 0;i<60;i++){
 context.moveto(x,y);
 context.arc(x,y,r,6*i*math.pi/180,6*(i+1)*math.pi/180,false);
 }
 context.closepath();
 context.stroke();
 //
 context.beginpath();
 context.fillstyle = "white";
 context.moveto(x,y);
 context.arc(x,y,r/1.1,-0,2*math.pi,false);
 context.closepath();
 context.fill();
 // 
 context.beginpath();
 context.linewidth = 3;
 for(var i = 0;i<12;i++){
 context.moveto(x,y);
 context.arc(x,y,r,30*i*math.pi/180,30*(i+1)*math.pi,false);
 }
 context.closepath();
 context.stroke();
 //
 context.beginpath();
 context.fillstyle = "white";
 context.moveto(x,y);
 context.arc(x,y,r/1.12,0,2*math.pi,false);
 context.closepath();
 context.fill();
 
 context.beginpath();
 context.fillstyle = "black";
 context.moveto(x,y);
 context.arc(x,y,r/30,0,2*math.pi,false);
 context.fill(); 
 //
 context.beginpath();
 context.linewidth = 5;
 context.moveto(x,y);
 context.arc(x,y,r/2.5,hvalue,hvalue,false);
 context.stroke();
 //
 context.beginpath();
 context.linewidth = 3;
 context.moveto(x,y);
 context.arc(x,y,r/2,mvalue,mvalue,false);
 context.stroke(); 
 //
 context.beginpath();
 context.linewidth = 2;
 context.moveto(x,y);
 context.arc(x,y,r/1.6,svalue,svalue,false);
 context.stroke();
}
window.onload = function(){
 canvas = document.getelementbyid('canvas');
 context = canvas.getcontext('2d');
 canvas.height = 500;
 canvas.width = 500;
 setinterval(draw,1000); 
 draw(); 
}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。