Js--各种基本类型之间的转换

• 数字转字符串

let num = 24
let str1 = num.toString() 
let str2 = num + ''

• 字符串转数字

let s = '24'
let num1 = Number(s) 
let num2 = s - 0
let num3 = parseInt(s)

• 数字转数字数组

let num = 24
let numArr = num.toString().split('').map(Number)

• 数字转字符串数组

let num = 24
let strignArr = num.toString().split('')

• 数字数组或字符串数组转数字

let numArr1 = [1,8,24]
let numArr2 = ['1','8','24']
let num1 = numArr1.join('') - 0 
let num2 = Number(numArr2.join(''))
let num3 = parseInt(numArr1.join(''))

• 数字数组转字符串数组

let numArr = [1,8,24]
let strArr = numArr.map(String)

• 字符串转数组

let str='Franklin'
let arr1 = str.split('')
let arr2 = Array.from(str)