Home  >  Article  >  Web Front-end  >  JS randomly sorted array example analysis

JS randomly sorted array example analysis

小云云
小云云Original
2018-01-25 10:35:301133browse

This article mainly introduces the JS random sorting array implementation method, and combines specific examples to compare and analyze the relevant operating techniques of javascript for random sorting of arrays. Friends who need it can refer to it. I hope it can help everyone.

When doing random display of recommended ads, I needed to randomly sort the data array, so I wrote one, as follows:


function randomOrder (targetArr) {
  var originalArr = targetArr;
  var newArr = [];
  var arrLength = targetArr.length;
  var j = -1;
  var tmpObj = {};
  for(var i = 0;i < arrLength;i++){
    while(true) {
      if(tmpObj[j = parseInt(arrLength * Math.random())] == undefined) {
        tmpObj[j] = 1;
        console.log(j);
        break;
      }
    }
    newArr[i] = originalArr[j];
  }
  return newArr;
}

But... later on the Internet When I saw the method written by the master, I felt that I was instantly killed to the point where nothing was left, as follows:


function sortNumber(a,b) {
  return Math.random() - 0.5;
}
var arr = arr=[9,3,1,2,5,8,4,7,6,0];
arr.sort(sortNumber);

Have you mastered it? Collect it if you find it useful.

Related recommendations:

Adding weight factors to PHP random sorting

Introduction to examples of JS implementing random sorting function

php array random sorting example

The above is the detailed content of JS randomly sorted array example analysis. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn