[英]Uncaught typeError: Cannot read property of undefined - object
我不認為我的腳本正在標識對象,而且我不確定為什么。
我從以下數據結構開始:
var state;
var init = function() {
state = {
runInfo: {
price: null,
containers: null,
servings: null
},
formula: [],
totalsServing: [],
totalsBottle: [],
totalsRun: []
};
};
然后將對象添加到“公式”數組中:
var addIngredient = function(name, amount, carrier, usdperkilo, origin, packSize) {
var ingredient = {
name: name,
amount: amount,
carrier: carrier,
usdperkilo: usdperkilo,
origin: origin,
packSize: packSize
};
state.formula.push(ingredient);
};
這一切都很好。 但是,當我創建另一個函數來操縱“ Formula”數組中的對象時,使用此函數會收到“ Uncaught TypeError:無法定義未定義的屬性'carrier'”:
addSection3Row = function(ingredient) {
var ingredient = state.formula[ingredient].name;
var carrier = (state.formula[ingredient].carrier/100)*(state.formula[ingredient].amount/(1-(state.formula[ingredient].carrier/100)));
var amount = state.formula[ingredient].amount;
var row = {
ingredient: ingredient,
carrier: carrier,
amount: amount,
totalAmount: carrier + amount
};
state.totalsServing.push(row);
};
我已經看過其他問題,帶有此錯誤消息,該問題通常似乎是javascript尚未定義變量。
我懷疑這也是我的情況,但我不明白為什么。
我在頁面底部的html下面運行以下代碼:
init();
addIngredient("St. John's Wort", 500, 4, 25, true, 25);
addIngredient("5-HTP", 100, 2, 165, true, 25);
addSection3Row(0);
console.log(state);
當我在控制台中運行以下代碼時:
(state.formula[ingredient].carrier/100)*(state.formula[ingredient].amount/(1-(state.formula[ingredient].carrier/100)))
它返回正確的值。 所以我知道我的腳本中有一些東西禁止js訪問對象,但是我不確定為什么。
在addSection3Row函數中,您將覆蓋第一行中的成分。
addSection3Row = function(ingredient) { //ingredient is number
var ingredient = state.formula[ingredient].name;//ingredient is string
var carrier = (state.formula[ingredient].carrier/100)*(state.formula[ingredient].amount/(1-(state.formula[ingredient].carrier/100)));
var amount = state.formula[ingredient].amount;
var row = {
ingredient: ingredient,
carrier: carrier,
amount: amount,
totalAmount: carrier + amount
};
state.totalsServing.push(row);
};
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