一、字符串转数组：
1、Array.split()
const str = 'hello'
str.split('') //['h','e','l','l','o']
const str2 = 'hello,world'
str2.split(',') //[hello,world]
2、[...string] 语句(ES6)
const str = 'hello'
[...str] //['h','e','l','l','o']
const str2 = 'hello, world'
[...str2] //['h','e','l','l','o',',','w','o','r','l','d']
3、Array.form()
const str = 'hello'
Array.form(str) //['h','e','l','l','o']
const str2 = 'hello, world'
Array.form(str2) //['h','e','l','l','o',',','w','o','r','l','d']
4、Object.assign([], string)
const str = 'hello'
Object.assign([], str) //['h','e','l','l','o']
const str2 = 'hello, world'
Object.assign([], str2) //['h','e','l','l','o',',','w','o','r','l','d']
二、数组转字符串
1、Array.join()
const arr = [1,2,3,4]
arr.join() //'1,2,3,4'
arr.join('') //'1234'
2、Array.toString()
const arr = [1,2,3,4]
arr.toString() //'1,2,3,4'
2、Array.toLocaleString()
const arr = [1,2,3,4]
arr. toLocaleString() //'1,2,3,4'
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