void 作用
void用于标识方法返回值的类型,表示该方法没有返回值。
function sayHello():void {
alert('Hello')
}
void 赋值
通常声明一个 void 类型的变量没什么用处,因为这个值只能赋予 undefined 和 null,如下:
let a: void = undefined
let b: void = null
2022-07-06 07:14:00 【MyBatis中文官网】
void用于标识方法返回值的类型,表示该方法没有返回值。
function sayHello():void {
alert('Hello')
}
通常声明一个 void 类型的变量没什么用处,因为这个值只能赋予 undefined 和 null,如下:
let a: void = undefined
let b: void = null
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