typescript “对象”类型上不存在属性
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Property does not exist on type 'object'
提问by Jason Tang
I have the follow setup and when I loop through using for...ofand get an error of Property "country" doesn not exist on type "object". Is this a correct way to loop through each object in array and compare the object property value?
我有以下设置，当我循环使用for...of并得到属性“国家”的错误时，类型“对象”不存在。这是循环遍历数组中的每个对象并比较对象属性值的正确方法吗？
let countryProviders: object[];
export function GetAllProviders() {
allProviders = [
{ region: "r 1", country: "US", locale: "en-us", company: "co 1" },
{ region: "r 2", country: "China", locale: "zh-cn", company: "co 2" },
{ region: "r 4", country: "Korea", locale: "ko-kr", company: "co 4" },
{ region: "r 5", country: "Japan", locale: "ja-jp", company: "co 5" }
]
for (let providers of allProviders) {
if (providers.country === "US") { // error here
countryProviders.push(providers);
}
}
}
回答by Saravana
You probably have allProviderstyped as object[]as well. And property countrydoes not exist on object. If you don't care about typing, you can declare both allProvidersand countryProvidersas Array<any>:
你可能也allProviders打过字object[]。并且country在 上不存在财产object。如果你不关心打字，你可以同时声明allProviders和countryProviders为Array<any>：
let countryProviders: Array<any>;
let allProviders: Array<any>;
If you do want static type checking. You can create an interface for the structure and use it:
如果您确实想要静态类型检查。您可以为结构创建一个接口并使用它：
interface Provider {
region: string,
country: string,
locale: string,
company: string
}
let countryProviders: Array<Provider>;
let allProviders: Array<Provider>;
