typescript - ts 如何继承父类并修改属性?

Question

ts 如何继承父类并修改属性?

相关代码

export interface ITableData {    flag: 0 | 1    measure_name: string    measure_value: number    result_desc: string    standard_deviation: number    standard_value: number    name: string}interface IMeasureData extends ITableData {    measure_value: number | string}const measureList: IMeasureData[] = [{ measure_value: "2" }]

Answer 1

export interface ITableData<T = number> {  flag: 0 | 1;  measure_name: string;  measure_value: T;  result_desc: string;  standard_deviation: number;  standard_value: number;  name: string;}const measureList: Partial<ITableData<number | string>>[] = [{ measure_value: "2" }];

我提出两个点吧：

1. 充分使用泛型2. 结合Partial实现可选参数

Answer 2

可以使用工具类型 Omit 将需要修改的属性 measure_value 剔除掉，然后继承剔除后的接口，并对该属性进行重新声名。（PS：如下代码中，我将原接口的属性改成可选属性，以避免赋值时的报错。）

export interface ITableData {  flag?: 0 | 1;  measure_name?: string;  measure_value?: number;  result_desc?: string;  standard_deviation?: number;  standard_value?: number;  name?: string;}interface IMeasureData extends Omit<ITableData, "measure_value"> {  measure_value: number | string;}const measureList: IMeasureData[] = [{ measure_value: "2" }];

希望对题主有所帮助！