1回答

keviny79

2022-09-12

这是几种特例赋值，见代码：

interface Door {

  [x: number]: any

}

let door: Door = { 3: "wangwu" }

let door21: Door = { username: "wangwu" } // 错误

const name0 = "username"

let door22: Door = { [name0]: "wangwu" } // 错误

//  ts 特例赋值

const name: string = "username" // 增加 string 类型

let door31: Door = { [name]: "wangwu" } // 正确  ts把[x:number]自动转换为[x:string]

const usr = { username: "wangwu", age: 23 }

let door32: Door = { [usr.username]: "wangwu" } // 正确   ts把[x:number]自动转换为[x:string]

const isName: symbol = Symbol()

let door4: Door = { [isName]: "wangwu" } // 正确  // 正确  ts把[x:number]自动转换为[x:symbol]

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