数组和字符串的转换、获取日期时间戳
1.隐式转换
let arr = [1,2,3,4]
arr+'' // '1,2,3,4'
let arr2 = [1,2,[3,[4]]]
arr2+'' // '1,2,3,4'
2.toString()
let arr = [1,2,3]
arr.toString() // 1,2,3
3.toLocalString()
let arr = [1,2,3]
arr.toLocalString() // 1,2,3
4.join()
let arr = [1,2,3]
arr.join() // 1,2,3
字符串转换成数组
1.split()
let str = 'abc'
str.split(',') //[a,b,c]
获取日期时间戳
1.
let date = +new Date()
2.
let date = new Date().getTime()