去重

Set

const arr = [1,1,2,2,3,3,3,4,4,5,6,7,7]
const newArr = [...new Set(arr)]

filter

const arr = [1,1,2,2,3,3,3,4,4,5,6,7,7]
const newArr = arr.filter((item, index, arr) => {
  return arr.indexOf(item) === index
})