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JS implements bubble sort, insertion sort and quick sort and sorts the output

高洛峰Original: 2016-12-29 15:54:451522browse

I was asked this question in an interview, but I was really confused and couldn't answer it. Later, I sorted it out through JS, and combined it with the html code to make a text box, and sorted the input content from the text box and output it. Once again, I will not describe it, but I will show it to you through a piece of code:

The following is the code:

index.html
 
 <!DOCTYPE html>
 <html>
 <head>
   <title>Sorting</title>
   <link rel="stylesheet" type="text/css" href="style.css">
 </head>
 <body>
  
   <!--主要页面结构-->
   <div class="container">
     <input type="text" name="number" id="number" placeholder="Please enter 10 numbers(don&#39;t leave space)" />
     <a href="javascript:void()" class="sortbtn" id="resultBtn">Sort</a>
     <label class="title">After Sorted:</label>
  
     <!--以下三个label分别显示冒泡，插入，快速排序的结果-->
     <label class="result" for="bubblesort"></label>
     <label class="result" for="insertsort"></label>
     <label class="result" for="quicksort"></label>
   </div>
   <!--end-->
    
   <script type="text/javascript" src="script.js"></script>
 </body>
 </html>

Let’s write some style to this page, otherwise it will not look good.

style.css
 
 *{
   margin: 0;
   padding: 0;
   list-style: none;
 }
 .container{
   width: 400px;
   margin: 100px auto;
 }
 input[type="text"]{
   display: block;
   width: 400px;
   height: 40px;
   text-align: center;
   line-height: 40px;
   outline: none;
   font-size: 14px;
   border-radius: 15px;
   border: 1px solid #aaaaaa;
 }
 .sortbtn{
   display: block;
   width: 200px;
   height: 34px;
   text-align: center;
   line-height: 34px;
   border: 1px solid black;
   border-radius: 10px;
   text-decoration: none;
   color: black;
   margin-left: 100px;
   margin-top: 30px;
 }
 .sortbtn:hover{
   display: block;
   background-color: black;
   color: #ffffff;
 }
 label{
   display: block;
   width: 200px;
   text-align: center;
   margin-left: 100px;
   margin-top: 20px;
   font-size: 20px;
 }

Then the main functions are implemented.

script.js
 
window.onload = function(){
  var btn = document.getElementById("resultBtn");      //结果输出按钮
  var inputnum = document.getElementById("number");    //数字输入框
  var resultlbl =document.getElementsByTagName("label");  //结果显示的label 
  var i,j,temp;
 
  //冒泡排序
  var bubble = function(arr){
    for(i=0;i<9;i++){
      for(j=0;j<9-i;j++){
        if(arr[j] > arr[j+1]){
          temp = arr[j];
          arr[j] = arr[j+1];
          arr[j+1] = temp;
        }
      }
    }
    return arr;
  }
 
  //插入排序
  var insersort = function(arr){
    for(i=1;i<10;i++){
      temp = arr[i];
      j = i;
      while(j > 0 && arr[j-1] > temp){
        arr[j] = arr[j-1];
        j--;
      }
      arr[j] = temp;
    }
    return arr;
  }
 
  //快速排序
  var quicksort = function(arr){
    var basenum,basenumIndex;
    var left = [];
    var right = [];
 
    if(arr.length <= 1){
      return arr;
    }
    //基准数的位置
    basenumIndex = Math.floor(arr.length/2);
    basenum = arr.splice(basenumIndex,1)[0];
    for(i=0;i<arr.length;i++){
      if(arr[i] < basenum){
        left.push(arr[i]);
      }
      else{
        right.push(arr[i]);
      }
     }
     //递归调用
     return quicksort(left).concat([basenum],quicksort(right));
   }
  
   //判断输入的值类型是否为数字
   function isNum(num){
    var reNum =/^[0-9]+$/;
    return (reNum.test(num)); 
}
  
   //按钮点击事件
   btn.onclick = function(){
     //判断输入的值的类型和长度以及是否为空
     if(!isNum(inputnum.value) || inputnum.value == "" || inputnum.value.length > 10 || inputnum.value.length < 10){
       resultlbl[0].innerHTML = "Your format is wrong![Must Be 10 numbers]";
       resultlbl[0].style.color = "red";
     }
     else{
       resultlbl[0].innerHTML = "After Sorted:";
       resultlbl[0].style.color = "black";
       var inputstream = inputnum.value.toString();  //将输入的内容转换为字符串
       var data = inputstream.split("");        //将转换的字符串分割，相当于转化为数组
        
       //结果输出
       resultlbl[1].innerHTML = "BubbleSort:" + "<br/>" + bubble(data);
       resultlbl[2].innerHTML = "InsertSort:" + "<br/>" + insersort(data);
       resultlbl[3].innerHTML = "QuickSort:" + "<br/>" + quicksort(data);
     }
   }
 }

The final effect is like this:

Without input, a quiet text box, a quiet button and a label: