JavaScript使用setTimeout实现倒计时效果

为了加强对JavaScript原生代码的编写能力，以及巩固setTimeout()的使用方法，制作了一个倒计时的demo，倒计时在现在的网站中算是一个常见的小功能，如果大家喜欢的话可以留下，就当作一个日常实用的小脚本。

实现思路

1、先获取小时值 将小时值减1开始进行倒计时 分钟59 秒数59
2、秒数的个位从9开始递减，当秒数个位小于0时，秒数的十位减1
3、秒数的十位小于0时，分钟的个位减1
4、分钟的个位小于0时，分钟的十位减1
5、分钟的十位小于0时，小时减1
6、小时数小于0后停止计时全部为0

实现代码

html

<p>倒计时：</p>
<span id="hour">5</span>
<span>:</span>
<span id="minuteTen">0</span>
<span id="minuteBit">0</span>
<span>:</span>
<span id="secondTen">0</span>
<span id="secondBit">0</span>

css

span{
 display: inline-block;
 width: 20px;
 height: 20px;
 background-color: #000000;
 color: #ffffff;
 text-align: center;
 }

JavaScript

 function time(){
 /*小时*/
 var hourTxt = document.getElementById("hour");
 var hour = parseInt(document.getElementById("hour").innerHTML);
 /*分钟*/
 var minuteTenTxt = document.getElementById("minuteTen");
 var minuteBitTxt = document.getElementById("minuteBit");
 var minuteTen = parseInt(document.getElementById("minuteTen").innerHTML);
 var minuteBit = parseInt(document.getElementById("minuteBit").innerHTML);
 /*秒*/
 var secondTenTxt = document.getElementById("secondTen");
 var secondBitTxt = document.getElementById("secondBit");
 var secondTen = parseInt(document.getElementById("secondTen").innerHTML);
 var secondBit = parseInt(document.getElementById("secondBit").innerHTML);
 function start(){
 hour--;
 hourTxt.innerHTML = hour;
 minuteTen = 5;
 minuteTenTxt.innerHTML = minuteTen;
 minuteBit = 9;
 minuteBitTxt.innerHTML = minuteBit;
 secondTen = 5;
 secondTenTxt.innerHTML = secondTen;
 secondBit = 9;
 secondBitTxt.innerHTML = secondBit;

 /*secondBit开始自减*/
 function second(){
  secondBit--;
  secondBitTxt.innerHTML = secondBit;

  /*十秒过后*/
  if(secondBit < 0){
  secondTen--;
  secondTenTxt.innerHTML = secondTen;
  secondBit = 9;
  secondBitTxt.innerHTML = secondBit;
  /*继续倒计时*/
  setTimeout(second,1000);

  /*一分钟过后*/
  if(secondTen < 0){
   minuteBit--;
   minuteBitTxt.innerHTML = minuteBit;
   secondTen = 5;
   secondTenTxt.innerHTML = secondTen;
   secondBit = 9;
   secondBitTxt.innerHTML = secondBit;

   /*十分钟过后*/
   if(minuteBit < 0){
   minuteTen--;
   minuteTenTxt.innerHTML = minuteTen;
   minuteBit = 9;
   minuteBitTxt.innerHTML = minuteBit;
   }

   /*一个小时过后*/
   if(minuteTen < 0){
   hour--;
   hourTxt.innerHTML = hour;
   minuteTen = 5;
   minuteTenTxt.innerHTML = minuteTen;
   minuteBit = 9;
   minuteBitTxt.innerHTML = minuteBit;
   secondTen = 5;
   secondTenTxt.innerHTML = secondTen;
   secondBit = 9;
   secondBitTxt.innerHTML = secondBit;
   }

   /*倒计时结束*/
   if(hour < 0 ){
   hour = 0;
   hourTxt.innerHTML = hour;
   minuteTen = 0;
   minuteTenTxt.innerHTML = minuteTen;
   minuteBit = 0;
   minuteBitTxt.innerHTML = minuteBit;
   secondTen = 0;
   secondTenTxt.innerHTML = secondTen;
   secondBit = 0;
   secondBitTxt.innerHTML = secondBit;
   clearTimeout(second);
   clearTimeout(start);
   }
  }
  }else{
  setTimeout(second,1000);
  }
 }
 setTimeout(second,1000);

 }
 setTimeout(start,1000);
}

执行页面

结束页面

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