Example of method for removing duplicate values in an array implemented in JavaScript

This article describes the method of array deduplication implemented by JS. Shared for everyone to refer to, as follows:

Running effect diagram is as follows:

Complete instance code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test</title>
<script type="text/javascript" language="javascript" >
Array.prototype.distinct = function() {
 var $ = this;
 var o1 = {}; //Store non-duplicate values
 var o2 = {}; //Store duplicate values
 var o3 = []; //Store duplicate values
 var o; //Array single variable
 for (var i = 0; o = $[i]; i++{
 if (o in o1{
  if (!(o in o2)) o2[o] = o;
  delete $[i];
 }else{}}
  o1[o] = o;
 }
 }
 $.length = 0; //Clear the original array
 for(o in o1{
 $.push(o);
 }
 for(o in o2{
 o3.push(o);
 }
 return o3;
}
var a = [2,2,2,3,3,3,4,4,5,6,7,7];
console.log("Original array:") + a); //2,2,2,3,3,3,4,4,5,6,7,7
console.log("The duplicated elements are:") + a.distinct()); //2,3,4,7
console.log("The sorted array is:") + a);      //2,3,4,5,6,7
console.log("The length after sorting is:") + a.length)    //6
</script>
</head>
<body>
</body>
</html>

PS: Here are several duplicate removal tools provided for everyone's reference and use:

Online Duplicate Item Removal Tool:
http://tools.jb51.net/code/quchong

Online Text Duplicate Removal Tool:
http://tools.jb51.net/aideddesign/txt_quchong

Readers who are interested in more content related to JavaScript can check the special topics of this site: 'Summary of JavaScript Array Operation Skills', 'Summary of JavaScript Sorting Algorithms', 'Summary of JavaScript Mathematical Operation Usage', 'Summary of JavaScript Data Structure and Algorithm Skills', 'Summary of JavaScript Traversal Algorithms and Skills', 'Summary of JavaScript Search Algorithm Skills', and 'Summary of JavaScript Error and Debugging Skills'.

Hoping the content described in this article will be helpful to everyone's JavaScript program design.

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