字面量类型(声明的类型为写死的值)
type a1=1 | 0 let p:a1 = 1 p = 'string'//错误
对象里面也同样适用
type resType = { code: 1001 | 1002 | 1003 //数字字面量联合类型 msg: string } const res = { code: 1001, msg: "接口成功" }
type a1=1 | 0 let p:a1 = 1 p = 'string'//错误
对象里面也同样适用
type resType = { code: 1001 | 1002 | 1003 //数字字面量联合类型 msg: string } const res = { code: 1001, msg: "接口成功" }