基本类型

• number
• string
• boolean
• Array
• undefined
• void
• 元组
• any

/**
 * 基本类型
 */

//number 
let age:number=12
console.log('age=',age)

//string
let city:string='Beijing'
console.log('city=',city)

//boolean
let isChina:boolean=true
console.log('isChina=',isChina)

//Array
let arr1:number[]=[1,3,5,7]
console.log('arr1=',arr1)
let arr2:Array<number>=[2,4,6,8]
console.log('arr2=',arr2)

//undefined
let x=undefined

console.log('x=',x)
let y
console.log('y=',y)

//元组-表示已知元素数量和类型的数组

let a:[string,number]

a=['张三',12]
console.log('a=',a)


//any-任意类型
let b:any=1;
console.log('b=',b)
b='xyz'
console.log('b=',b)