Javascript:通用获取数组中的下一项 [英] Javascript: Generic get next item in array

问题描述

我正在尝试创建一个 JavaScript 函数，它将在字符串数组中搜索一个值并返回下一个字符串.例如，如果构建了一个数组，使得一个项目后跟其股票代码，我想搜索该项目并写入股票代码.

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

(我确信很明显我是 JavaScript 的新手，虽然这与我发现的许多其他问题类似，但这些问题似乎涉及更多的数组或更复杂的搜索.我似乎无法简化他们满足我的需要.)

(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.)

推荐答案

你几乎猜对了，但语法是 arr[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]

顺便说一句，使用对象而不是数组可能是更好的选择:

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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