es6数组合并

1、合并

let arr = [1, 3, 5, 7, 9]
let arr1 = [2, 4, 5, 6, 8]
let newArr = []
newArr = Array.from([...arr,...arr1])
console.log(newArr)
输出：[1, 3, 5, 7, 9, 2, 4, 5, 6, 8]

2、合并 去重

let arr = [1, 3, 5, 7, 9]
let arr1 = [2, 4, 5, 6, 8]
let newArr = []
newArr = Array.from(new Set([...arr,...arr1]))
console.log(newArr)
输出：[1, 3, 5, 7, 9, 2, 4, 6, 8]

3、合并 去重 排序

let arr = [1, 3, 5, 7, 9]
let arr1 = [2, 4, 5, 6, 8]
let newArr = []
newArr = Array.from(new Set([...arr,...arr1]))
newArr.sort(function(a, b) { //callback
  if (a > b) {
    return 1  //返回正数 ，b排列在a之前
  } else {
    return -1 //返回负数 ，a排列在b之前
  }
})
console.log(newArr)
输出：[1, 2, 3, 4, 5, 6, 7, 8, 9]