ES5和ES6两种方法合并两个数组并去重

ES6语法合并两个数组并去重

let arr1 = [1, 1, 2, 3, 6, 9, 5, 5, 4]
let arr2 = [1, 2, 5, 4, 9, 7, 7, 8, 8]
function uniqueArr(arr1, arr2) {
  //合并两个数组
  arr1.push(...arr2)//或者arr1 = [...arr1,...arr2]
  //去重
  let arr3 = Array.from(new Set(arr1))//let arr3 = [...new Set(arr1)]
  console.log(arr3)
}
uniqueArr(arr1, arr2)

注：new Set()接收一个数组，并且数组中的元素是唯一的。Array.from()能把伪数组转化为真正的数组。

ES5语法合并两个数组并去重

let arr1 = [1, 1, 2, 3, 6, 9, 5, 5, 4]
let arr2 = [1, 2, 5, 4, 9, 7, 7, 8, 8]
function uniqueArr(arr1, arr2) {
  var arr3 = arr1.concat(arr2)
  var arr4 = []
  for (var i = 0, len = arr3.length; i < len; i++) {
    if (arr4.indexOf(arr3[i]) === -1) {
      arr4.push(arr3[i])
    }
  }
  console.log(arr4)
}
uniqueArr(arr1, arr2)