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一个简易时钟效果js实现代码

2017年12月12日  | 移动技术网IT编程  | 我要评论

本文实例为大家分享了js时钟特效 的具体代码，供大家参考，具体内容如下


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);

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移动技术网。

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