马上跨年了，如何用代码写一个“跨年倒计时”呢？_跨年倒计时代码

作者：2023面试高手 | 2024-02-15 14:52:29

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跨年倒计时代码

参考 okeyl.com


<!doctype html>
 
<html>
 
<head>
 
<meta charset="utf-8">
 
<title>新年快乐</title>
 
<style>
 
body{
 
  overflow: hidden;
 
  margin: 0;
 
}
 
h1{
 
  position: fixed;
 
  top: 30%;
 
  left: 0;
 
  width: 100%;
 
  text-align: center;
 
  transform:translateY(-50%);
 
  font-family: 'Love Ya Like A Sister', cursive;
 
  font-size: 60px;
 
  color: ff64d9;
 
  padding: 0 20px;
 
}
 
h1 span{
 
  position: fixed;
 
  left: 0;
 
  width: 100%;
 
  text-align: center;
 
margin-top:30px;
 
    font-size:40px;
 
}
 
</style>
 
</head>
 
<body>
 
<h1 id="h1"></h1>
 
<canvas></canvas> 
 
<script>
 
var canvas = document.querySelector("canvas"),
 
  ctx = canvas.getContext("2d");
 
var ww,wh;
 
function onResize(){
 
  ww = canvas.width = window.innerWidth;
 
  wh = canvas.height = window.innerHeight;
 
}
 
ctx.strokeStyle = "red";
 
ctx.shadowBlur = 25;
 
ctx.shadowColor = "hsla(0, 100%, 60%,0.5)";
 
var precision = 100;
 
var hearts = [];
 
var mouseMoved = false;
 
function onMove(e){
 
  mouseMoved = true;
 
  if(e.type === "touchmove"){
 
    hearts.push(new Heart(e.touches[0].clientX, e.touches[0].clientY));
 
    hearts.push(new Heart(e.touches[0].clientX, e.touches[0].clientY));
 
  }
 
  else{
 
    hearts.push(new Heart(e.clientX, e.clientY));
 
    hearts.push(new Heart(e.clientX, e.clientY));
 
  }
 
}
 
var Heart = function(x,y){
 
  this.x = x || Math.random()*ww;
 
  this.y = y || Math.random()*wh;
 
  this.size = Math.random()*2 + 1;
 
  this.shadowBlur = Math.random() * 10;
 
  this.speedX = (Math.random()+0.2-0.6) * 8;
 
  this.speedY = (Math.random()+0.2-0.6) * 8;
 
  this.speedSize = Math.random()*0.05 + 0.01;
 
  this.opacity = 1;
 
  this.vertices = [];
 
  for (var i = 0; i < precision; i++) {
 
    var step = (i / precision - 0.5) * (Math.PI * 2);
 
    var vector = {
 
      x : (15 * Math.pow(Math.sin(step), 3)),
 
      y : -(13 * Math.cos(step) - 5 * Math.cos(2 * step) - 2 * Math.cos(3 * step) - Math.cos(4 * step))
 
    }
 
    this.vertices.push(vector);
 
  }
 
}
 
Heart.prototype.draw = function(){
 
  this.size -= this.speedSize;
 
  this.x += this.speedX;
 
  this.y += this.speedY;
 
  ctx.save();
 
  ctx.translate(-1000,this.y);
 
  ctx.scale(this.size, this.size);
 
  ctx.beginPath();
 
  for (var i = 0; i < precision; i++) {
 
    var vector = this.vertices[i];
 
    ctx.lineTo(vector.x, vector.y);
 
  }
 
  ctx.globalAlpha = this.size;
 
  ctx.shadowBlur = Math.round((3 - this.size) * 10);
 
  ctx.shadowColor = "hsla(0, 100%, 60%,0.5)";
 
  ctx.shadowOffsetX = this.x + 1000;
 
  ctx.globalCompositeOperation = "screen"
 
  ctx.closePath();
 
  ctx.fill()
 
  ctx.restore();
 
};
 
function render(a){
 
  requestAnimationFrame(render);
 
  hearts.push(new Heart())
 
  ctx.clearRect(0,0,ww,wh);
 
  for (var i = 0; i < hearts.length; i++) {
 
    hearts[i].draw();
 
    if(hearts[i].size <= 0){
 
      hearts.splice(i,1);
 
      i--;
 
    }
 
  }
 
}
 
onResize();
 
window.addEventListener("mousemove", onMove);
 
window.addEventListener("touchmove", onMove);
 
window.addEventListener("resize", onResize);
 
requestAnimationFrame(render);
 
window.onload=function starttime(){
 
        time(h1,'2023,01,01');    // 2023年元旦时间
 
        ptimer = setTimeout(starttime,1000); // 添加计时器
 
}
 
    function time(obj,futimg){
 
        var nowtime = new Date().getTime(); // 现在时间转换为时间戳
 
        var futruetime =  new Date(futimg).getTime(); // 未来时间转换为时间戳
 
        var msec = futruetime-nowtime; // 毫秒 未来时间-现在时间
 
        var time = (msec/1000);  // 毫秒/1000
 
        var day = parseInt(time/86400); // 天  24*60*60*1000
 
        var hour = parseInt(time/3600)-24*day;    // 小时 60*60 总小时数-过去的小时数=现在的小时数
 
        var minute = parseInt(time%3600/60); // 分 -(day*24) 以60秒为一整份 取余 剩下秒数 秒数/60 就是分钟数
 
        var second = parseInt(time%60);  // 以60秒为一整份 取余 剩下秒数
 
        obj.innerHTML="<br>距离2023年还有：<br>"+day+"天"+hour+"小时"+minute+"分"+second+"秒"+"<br><span>平安喜乐<br>万事顺遂</span>"
 
        return true;
 
    }
 
</script>
 
</body>
 
</html>

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