JavaScript time sorting algorithm implements event flash countdown effect_javascript skills

Making an event page flash sale list page requires a long time of algorithmic sorting. I thought about it for a long time and tried various algorithms but couldn’t figure it out. Later I asked the next PHP classmate in the background and he wrote an algorithm and showed it to me. , when I first looked at it, I felt that it was a pure algorithm and could not be converted into the DOM effect of the page. But after reading it twice, I found that it could be done, so I changed it, implemented it, and shared it with everyone first.

The page requirements are: from 11 o'clock to 20 o'clock, there will be a flash sale every hour. If it is the current time, it will be displayed as a flash sale, and the previous products will be moved to the last row, and so on

A similar sequence of the first 11 points is 11,12,13,14,15,16,17,18,19,20 (points);
The order to 12 o'clock is 12,13,14,15,16,17,18,19,20, 11 (point)
The order to 13 o'clock is 13,14,15,16,17,18,19,20,12,11 (points)
. . . . .
The final order is 20, 19, 18, 17, 16, 15, 13, 12, 11 (points)

This is the pure algorithm of the classmates in the background

function show_test(hour)
  {
   p = ['13 dian','14 dian','15 dian ','16 dian','17 dian','18 dian','19 dian','20 dian'];
   console.log('原顺序是');
   console.log(p);
   date = new Date();
   curHour = date.getHours();
   pos = curHour - 13;
   //pos = hour;
   s = '活动'+ p[pos]+"正在进行";
   console.log(s);
   desc = '当前的顺序应该是';
   p.reverse();
   console.log(pos);
  
   tmp = []
   for(i = 0 ; i<pos; i++){
    tmp.push(p.pop());
   }
   p.reverse();
   p = p.concat(tmp.reverse());
   console.log(desc);
   console.log(p);
   console.log("\n\n");
  }

Call

var curHour=new Date().getHours();
show_test(curHour);

This algorithm perfectly implements the requirements required, but the question arises: how to actually convert it into a page, so after thinking about it, I implemented it perfectly;

//首先定义一个包含了每个秒杀的商品的id和图片的数组 img1是商品图片 img2是秒杀时间 img3是商品描述

var data=[
 { id:1,
 time:11,
 img1:"1.jpg",
 img2:"11.jpg",
 img3:"111.jpg"
  
 },
 { id:2,
 time:12,
 img1:"2.jpg",
 img2:"22.jpg",
 img3:"222.jpg"
  
 },
 { id:3,
 time:13,
 img1:"3.jpg",
 img2:"33.jpg",
 img3:"333.jpg"
  
 },
 { id:4,
 time:14,
 img1:"4.jpg",
 img2:"44.jpg",
 img3:"444.jpg"
 },
 { id:5,
 time:15,
 img1:"5.jpg",
 img2:"55.jpg",
 img3:"555.jpg"
 },
 { id:6,
 time:16,
 img1:"6.jpg",
 img2:"66.jpg",
 img3:"666.jpg"
 },
 { id:7,
 time:17,
 img1:"7.jpg",
 img2:"77.jpg",
 img3:"777.jpg"
 },
 { id:8,
 time:18,
 img1:"8.jpg",
 img2:"88.jpg",
 img3:"888.jpg"
 },
 { id:9,
 time:19,
 img1:"9.jpg",
 img2:"99.jpg",
 img3:"999.jpg"
 },
 { id:10,
 time:20,
 img1:"10.jpg",
 img2:"101.jpg",
 img3:"1010.jpg"
 }

 ];

//对象数组排序 
function compare(propertyName) { 
 return function (object1, object2) { 
 var value1 = object1[propertyName]; 
 var value2 = object2[propertyName]; 
 if (value2 < value1) { 
  return -1; 
 }else if (value2 > value1) { 
  return 1; 
 }else { 
  return 0; 
 } 
 } 
} 
//因为现在的数组已经变成了一个复杂的数组 所以排序要用到根据对象的某个属性排序这歌方法
//这个方法在javascript高级程序设计里面有提到过 

 function itemShow(hour)
  {
   p=data;
   //当前时间
   curHour = hour; 
   //对应时间的数组下标

   pos = curHour - 11;
   if(pos<=0){ //如果没到11点就显示最开始的顺序
    pos=0;
   }else if(pos>=9){//如果超过20点 就完全倒序
    pos=9
   }
   s = '活动'+ p[pos]+"正在进行";
   console.log(s);
   //根据数组里的 时间这个属性反向排序
   p.reverse(compare("time"));
   console.log(pos);
   console.log(p);
   //定义一个临时数组存放过时的商品项
   tmp = []
   for(i = 0 ; i<pos; i++){
    tmp.push(p.pop());
   }
   //将剩余的再反相排序
   p.reverse(compare("time"));
   //将未到秒杀时间的商品项目与已经过期的数组链接
   p = p.concat(tmp.reverse(compare("time"))); //
   console.log(desc);
   console.log(p);

   for(var i=0;i<data.length;i++){
    if(i==0){//正在秒杀 
    $(".item").eq(0).append("<img src='"+p[i].img1+"' id="+p[i].id+">")
    $(".item").eq(0).append("<img src='"+"killsecond_now.jpg"+"'>")
    $(".item").eq(0).append("<img src='"+p[i].img3+"'>")
    }else{
    $(".item").eq(i).append("<img src='"+p[i].img1+"' id="+p[i].id+">")
    $(".item").eq(i).append("<img src='"+p[i].img2+"'>")
    $(".item").eq(i).append("<img src='"+p[i].img3+"'>")
    }
   } 

   
  }

This implements the algorithm into a page display. I hope everyone can gain something and understand the javascript time sorting algorithm.