You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
17 lines
433 B
17 lines
433 B
// 使用泛型创建一个函数
|
|
|
|
function id<Type>(value: Type) : Type { // <Type> 相当于是一个占位符
|
|
return value
|
|
}
|
|
|
|
// 调用泛型函数：
|
|
// 1.以 number 类型调用泛型函数
|
|
const num = id<number>(10)
|
|
|
|
// 2.以 string 类型调用泛型函数
|
|
const str = id<string>('a')
|
|
const ret = id<boolean>(false)
|
|
|
|
// 泛型简写
|
|
let num1 = id(100) // number类型
|
|
let str1 = id('abc') // string类型
|