使用Javascript：通用获得数组下一个项目 [英] Javascript: Generic get next item in array

问题描述

我试图做一个Javascript功能，将搜索字符串数组的值，并返回下一个字符串。例如，如果一个数组是建立这样一个项目后面是其股价code，我想搜索的项目，并有股票code写的。

I am trying to make a Javascript function that will search an array of strings for a value and return the next string. For example, if an array is built such that an item is followed by its stock code, I want to search for the item and have the stock code written.

var item = (from user input); //some code to get the initial item from user
function findcode(code){
 var arr = ["ball", "1f7g", "spoon", "2c8d", "pen", "9c3c"]; //making the array
 for (var i=0; i<arr.lenth; i++){  //for loop to look through array
  arr.indexOf(item);  //search array for whatever the user input was
  var code = arr(i+1); //make the variable 'code' whatever comes next
  break;
  }
 }
document.write(code); //write the code, i.e., whatever comes after the item

（我敢肯定，很明显我是新来的Javascript，虽然这是类似一些，我发现其他问题，那些似乎有更多的参与阵列或更复杂的搜索，我似乎不能简化他们对我的需要。）

(I'm sure it's obvious I'm new to Javascript, and while this is similar to a number of other questions I found, those seemed to have more involved arrays or more complex searches. I can't seem to simplify them for my needs.)

谢谢！

推荐答案

您已经几乎得到了它的权利，但语法是改编[X] ，而不是 ARR（X）：

You've almost got it right, but the syntax is arr[x], not arr(x):

index = array.indexOf(value);
if(index >= 0 && index < array.length - 1)
   nextItem = array[index + 1]

BTW，使用对象而不是数组的可能是一个更好的选择：

BTW, using an object instead of an array might be a better option:

data = {"ball":"1f7g", "spoon":"2c8d", "pen":"9c3c"}

，然后简单地

code = data[name]

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