ES6小技巧笔记

1:去重数组

let a = [1, 1, 2, 2, 3, 3, 4, 4, 5, 5]

let b = [...new Set(a)]

console.log(2222222222, b)        // [1, 2, 3, 4, 5]

 

2:合并数组

 

let arr1 = ['a', 'b']

let arr2 = ['c']

let arr3 = ['d', 'e']

let arr4 = arr1.concat(arr2, arr3)

let arr5 = [...arr1, ...arr2, ...arr3]

console.log(111111111, arr4)   　　  //  ["a", "b", "c", "d", "e"]   ES5

console.log(222222222, arr5)     //  ["a", "b", "c", "d", "e"]    ES6

 

3:反转数组

 

let a = '123456789'

console.log(111111, [...a].reverse().join(''))   //  "987654321" 字符串便数组仔反转再取数组放到字符串

 

 

4:字符串拼接

 

 

let name = 'Datura'

let age = 18

let sex = '其它'

let hobby = '敲代码'

let str1 = `名字${name}，年纪${age}，性别${sex}，爱好${hobby}，`      // 注意此处有两个“ `` ”

console.log(111111, str1)   // 名字Datura，年纪18，性别其它，爱好敲代码