Chrome會對key為數字的陣列自動排序

根據：

http://javascriptweblog.wordpress.com/2011/01/04/exploring-javascript-for-in-loops/

提到：

Numerically named properties in Chrome
Chrome browsers process numerically named keys first and in numeric sequence not insertion sequence.

1 2 3 4 5 6 7 8 9

var obj = {3:'a', 2:'b', 'foo':'c', 1:'d'}, result = []; for (var prop in obj) {     result.push(prop); } result.toString(); //Chrome -> "1,2,3,foo" //Other browsers -> "3,2,foo,1"

自作聰明，陣列排序自有其意義，有需要自然會sort，害人多花時間除錯。

必須先用文字取代key，進入回圈後再還原成數值。