typeScript学习
字面量数据类型：
// type A = number | string
// let a:A = "abc"
// type num = number
// let n:num = 3
type num = 1 | 2 | 3
let n:num = 2
// 错误情况
// let n:num = 4
type increaseFlag = 0 | 1
function isStartUp(increase:increaseFlag){
if(increase){
console.log('open')
}else{
console.log('close')
}
}
isStartUp(0)
// 错误情况
// isStartUp(2)
标签：typeScript,isStartUp,数据类型,TS,num,let,type From： https://www.cnblogs.com/kongbaige/p/17622321.html