javascript如何动态地将子字典附加到父字典

Question

我有一个像这样的Javascript对象：const childDict = {  address: {    zip: "GGHG654",    city: "Morocco",    number: 40  }}我想在这样的循环中动态地将它添加到另一个父字典中：let parentDict = {}for(let i = 0 ; i < 3; i++){  parentDict["place" + i] = childDict}所以最后我得到了一个像这样的字典：{  place0: {    address: {      zip: "GGHG654",      city: "Morocco",      number: 40    }  },  place1: {    address: {      zip: "GGHG654",      city: "Morocco",      number: 40    }  }}然而，for循环给了我一个编译错误：Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{}'.  No index signature with a parameter of type 'string' was found on type '{}'.

Answer 1

let parentDict = {}

这没有明确设置导致此问题的类型。尝试提供any如下类型：

let parentDict:any = {}

或者，更准确地说：

let parentDict:{[key: string]: object} = {}

Answer 2

您只需向父字典添加适当的接口，因为打字稿会根据初始值自动分配类型，初始值没有任何键

interface IParentDict {

    [key: string]: any; // possibly change any to the typeof child dict

}

const parentDict: IParentDict = {};

Answer 3

像这样试试

let parentDict: any = {};

另一种选择可能是以更正确的方式指定类型，例如

let parentDict: {[key: string]: any} = {};

另一种骇人听闻的方式是

let parentDict = {}

for(let i = 0 ; i < 3; i++){

    (parentDict as any)["place" + i] = childDict

}