jQuery分割一个子数组，并使用each/map返回一个新数组 [英] jquery malipulate a subarray, and return a new array using each/map

问题描述

我的字符串形式为

ItemName1:Rate1:Tax1_ItemName2:Rate2:Tax2:_ItemName3:Rate3:Tax3_ItemName4:Rate4:Tax4(依此类推，直到第25条).

ItemName1:Rate1:Tax1_ItemName2:Rate2:Tax2:_ItemName3:Rate3:Tax3_ItemName4:Rate4:Tax4 (and so on, upto item 25).

我要做的是，当该字符串被_分割时，用户将传递一个索引，(例如2)在该索引处抓取该项目，例如.如果index为2，我将得到子字符串ItemName3:Rate3:Tax3.用户将传递的另一件事是3个参数，分别表示newItem，newRate和newTax，然后我必须用这些新值和替换在该特定索引处找到的这些旧项目.新的字符串.也许一个例子可以清楚地说明

What I have to do is, user will pass a index, (say 2) grab the item at that index, when this string is split by _, for eg. if index is 2, I would get the substring ItemName3:Rate3:Tax3. another thing the user will pass is 3 args, indicating newItem, newRate, and newTax, then I have to replace these old items found at that particular index with these new values and return the new string. Perhaps an example would make it clear

var itemList=ItemName1:Rate1:Tax1_ItemName2:Rate2:Tax2:_ItemName3:Rate3:Tax3_ItemName4:Rate4:Tax4

用户传递的参数2, Denim Jeans, 399.00, 14.34.
这必须替换原始的itemList并返回

user passed arguments, 2, Denim Jeans, 399.00, 14.34.
This must replace the original itemList and return

ItemName1:Rate1:Tax1_ItemName2:Rate2:Tax2:_Denim Jeans:399.00:14.34_ItemName4:Rate4:Tax4

(希望我说清楚了).
我知道最简单的方法是先将itemList除以_，然后在给定的索引处，除以:，然后替换那些项，然后使用for循环创建一个新字符串，然后返回该新字符串.但这似乎需要大量工作.尽管可能在for内，但没有简单的方法可以通过使用.each()和/或.map()来实现这一点，我不介意！

(Hope I made myself clear).
I know the simplest way would be first split the itemList by _ and then at given index, split by : and then replace those items, then using a for loop make a new string and then return that new string. But it seems like a lot of work. Isn't there a simple way that this could be achieved by using .each() and/or .map(), though may be inside a for, I won't mind that!

推荐答案

您的意思是这样的吗?

var items = str.split('_').map(function(v){ return v.split(':') });

这将生成一个数组:

[
  ["ItemName1","Rate1","Tax1"],
  ["ItemName2","Rate2","Tax2"],
  ["ItemName3","Rate3","Tax3"],
  ["ItemName4","Rate4","Tax4"]
]

演示: http://jsfiddle.net/elclanrs/7uVDM/

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