1.定义函数
参数要加类型,要有返回值
function add(x: number, y: number): number { return x + y; } //匿名函数 let myAdd = function(x: number, y: number): number { return x + y; };
参数要加类型,要有返回值
function add(x: number, y: number): number { return x + y; } //匿名函数 let myAdd = function(x: number, y: number): number { return x + y; };