以下是我使用的方法:

var newArr = a1.filter(function(elem) {
            return a2.indexOf(elem) === -1;
        }).concat( a2.filter(function(elem) {
            return a1.indexOf(elem) === -1;
        }));
console.log(newArr);

或者这个

var newArr = a1.concat(a2);
        function check(item) {
            if (a1.indexOf(item) === -1 || a2.indexOf(item) === -1) {
                return item;
            }
        }
        return newArr.filter(check);

function diff(arr1, arr2) {
  var filteredArr1 = arr1.filter(function(ele) {
    return arr2.indexOf(ele) == -1;
  });

  var filteredArr2 = arr2.filter(function(ele) {
    return arr1.indexOf(ele) == -1;
  });
  return filteredArr1.concat(filteredArr2);
}

diff([1, "calf", 3, "piglet"], [1, "calf", 3, 4]); // Log ["piglet",4]

我同意@luis-sieira的解决方案

我创建了位自解释函数，便于初学者一步一步理解:

function difference(oneArr, twoArr){
  var newArr = [];
  newArr = oneArr.filter((item)=>{
      return !twoArr.includes(item)
  });
  console.log(newArr)
    let arr = twoArr.filter((item)=>{
        return !oneArr.includes(item)
     });
    newArr =  newArr.concat(arr);
  console.log(newArr)
}
difference([1, 2, 3, 5], [1, 2, 3, 4, 5])

这个怎么样:

Array.prototype.contains = function(needle){
  for (var i=0; i<this.length; i++)
    if (this[i] == needle) return true;

  return false;
} 

Array.prototype.diff = function(compare) {
    return this.filter(function(elem) {return !compare.contains(elem);})
}

var a = new Array(1,4,7, 9);
var b = new Array(4, 8, 7);
alert(a.diff(b));

这样你就可以用array1。diff(array2)来得到它们的区别算法的时间复杂度很可怕- O(array1。长度(我相信)

修正了一下最佳答案

function arr_diff(a1, a2)
{
  var a=[], diff=[];
  for(var i=0;i<a1.length;i++)
    a[a1[i]]=a1[i];
  for(var i=0;i<a2.length;i++)
    if(a[a2[i]]) delete a[a2[i]];
    else a[a2[i]]=a2[i];
  for(var k in a)
   diff.push(a[k]);
  return diff;
}

这将考虑当前的元素类型。B /c当我们创建一个[a1[i]]时，它将一个值从原始值转换为字符串，因此我们失去了实际值。

**这将根据'type'参数为任意2个数组返回一个唯一值数组，或一个重复值数组，或一个非重复值数组(difference)。**

let json1 = ['one', 'two']
let json2 = ['one', 'two', 'three', 'four']

function uniq_n_shit (arr1, arr2, type) {

  let concat = arr1.concat(arr2)
  let set = [...new Set(concat)]

  if (!type || type === 'uniq' || type === 'unique') {

    return set

  } else if (type === 'duplicate') {

    concat = arr1.concat(arr2)
    return concat.filter(function (obj, index, self) {
      return index !== self.indexOf(obj)
    })

  } else if (type === 'not_duplicate') {

    let duplicates = concat.filter(function (obj, index, self) {
      return index !== self.indexOf(obj)
    })

    for (let r = 0; r < duplicates.length; r++) {
      let i = set.indexOf(duplicates[r]);
      if(i !== -1) {
        set.splice(i, 1);
      }
    }

    return set

  }
}

console.log(uniq_n_shit(json1, json2, null)) // => [ 'one', 'two', 'three', 'four' ]
console.log(uniq_n_shit(json1, json2, 'uniq')) // => [ 'one', 'two', 'three', 'four' ]
console.log(uniq_n_shit(json1, json2, 'duplicate')) // => [ 'one', 'two' ]
console.log(uniq_n_shit(json1, json2, 'not_duplicate')) // => [ 'three', 'four' ]