Javascript 变量未定义错误

Question

我有以下代码:

// Get combination prices
var combID = $('#idCombination').val();
var combinationsFromController;
var combination = combinationsFromController[combID];

if (typeof combination === 'undefined')
    return;

// Set product (not the combination) base price
var basePriceWithoutTax = +productPriceTaxExcluded;
var basePriceWithTax = +productPriceTaxIncluded;
var priceWithGroupReductionWithoutTax = 0;

当我执行它时，Chrome 总是提示:

combinationsFromController is not defined.

谁能帮我看看为什么会发生这种情况？

我尝试过:

var combinationsFromController = new Array();
var combination = combinationsFromController[combID];

运气不好。

Answer 1

您从未从 Controller 定义组合。

var combinationsFromController;
// combinationsFromController is undefined because you did not give it a value

您必须先给变量赋值，然后才能使用它们。

你可能想要

var combinationsFromController = getCombitationsFromController()

将 getCombitationsFromController() 替换为从 Controller 获取组合的代码。