<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>JS数组去重和取重</title> </head> <script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script> <body> </body> <script> Array.prototype.distinct = function () { var a = [], b = []; for (var prop in this) { var d = this[prop]; if (d === a[prop]) continue; //防止循环到prototype if (b[d] != 1) { a.push(d); b[d] = 1; } } return a; } var x = [1,1,2,2,3,4,4,5]; document.write('原始数组:' + x); document.write("<br />"); document.write('去重复后:' + x.distinct()); document.write("<br />"); </script> 方法二：取重复数据 <script type="text/javascript"> Array.prototype.distinct = function () { var a = [], b = [], c = [], d = []; for (var prop in this) { var d = this[prop]; if (d === a[prop]) { continue; }//防止循环到prototype if (b[d] != 1) { a.push(d); b[d] = 1; } else { c.push(d); d[d] = 1; } } //return a; return c.distinct1(); } Array.prototype.distinct1 = function () { var a = [], b = []; for (var prop in this) { var d = this[prop]; if (d === a[prop]) continue; //防止循环到prototype if (b[d] != 1) { a.push(d); b[d] = 1; } } return a; } var x = [1,1,2,2,3,4,4,5]; document.write("<br />"); document.write('原始数组:' + x); document.write("<br />"); document.write('去重复后:' + x.distinct()); </script> </html>