<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>test</title> </head> <body> </body> </html> <script type="text/javascript"> var arr=[1,2,2,3,4,1,2,3,4,5,222,5,6,7,6,7,6,7,8,9,111] var re=[]; var json={}; for (var i = 0; i < arr.length; i++) { if(!json[arr[i]]){ re.push(arr[i]) json[arr[i]]=true; } }; console.log(re) var arr2=[1,2,2,3,4,1,2,3,4,5,222,5,6,7,6,7,6,7,8,9,111] arr2.sort(); var rr=[]; for (var i = 0; i < arr2.length; i++) { if (rr[rr.length-1]!=arr2[i]) { rr.push(arr2[i]); }; }; console.log(rr) </script>
俩方法，都是网上找的，不过已经琢磨清楚了，这样算是自己的了吧
原文：http://www.cnblogs.com/busicu/p/4218211.html