var arr=[
[11,12,13,"內容","內容2"],
[21,22,23,"內容","內容2"],
[31,32,33,"內容","內容2"]
];
var arr2=[
[11,12,13],
[21,22,23],
[31,32,33]
];想向各位大佬求一個簡單的方法，arr的每一項截取前三位得到的結果如arr2想到的方法只有自己新建一個空數組，處理數據之后，放到arr2中
嵌套數組的截取
函數式編程
2018-09-24 16:44:29
