这是一个提议的标准:对于当前阶段2的提议https://github.com/tc39/proposal-set-methods，您可以使用

mySet.intersection(mySet2);

在此之前，你可以使用Immutable.js的Set，它激发了这个提议

Immutable.Set(mySet).intersect(mySet2)

使用Underscore.js或lodash.js

_.intersection( [0,345,324] , [1,0,324] )  // gives [0,324]

使用Array.prototype.filter和Array.prototype.includes的组合:

const filteredArray = array1.filter(value => array2.includes(value));

对于较旧的浏览器，使用Array.prototype.indexOf且不使用箭头函数:

var filteredArray = array1.filter(function(n) {
    return array2.indexOf(n) !== -1;
});

NB !.includes和. indexof都在内部使用===来比较数组中的元素，所以如果数组包含对象，它只比较对象引用(而不是对象的内容)。如果你想指定自己的比较逻辑，请使用Array.prototype.some。

Var数组= [ [1,2,3]， [2,3,4,5] ］ 函数commonValue(…arr) { 令res = arr[0]。过滤(函数(x) { 返回arr.every((y) => y.includes(x)) }) 返回res; ｝ commonValue数组(…);

//在线性时间内返回数组a中也在b中的元素: 函数相交(a, b) { 返回a.filter (Set.prototype。new Set(b)); ｝ / /例如: console.log(相交([1,2,3],[2、3、4、5]));

我推荐上述简洁的解决方案，它在大输入上优于其他实现。如果在小输入上的性能很重要，请检查下面的替代方案。

备选方案和性能比较:

有关替代实现，请参阅下面的代码片段，并检查https://jsperf.com/array-intersection-comparison以进行性能比较。

function intersect_for(a, b) { const result = []; const alen = a.length; const blen = b.length; for (let i = 0; i < alen; ++i) { const ai = a[i]; for (let j = 0; j < blen; ++j) { if (ai === b[j]) { result.push(ai); break; } } } return result; } function intersect_filter_indexOf(a, b) { return a.filter(el => b.indexOf(el) !== -1); } function intersect_filter_in(a, b) { const map = b.reduce((map, el) => {map[el] = true; return map}, {}); return a.filter(el => el in map); } function intersect_for_in(a, b) { const result = []; const map = {}; for (let i = 0, length = b.length; i < length; ++i) { map[b[i]] = true; } for (let i = 0, length = a.length; i < length; ++i) { if (a[i] in map) result.push(a[i]); } return result; } function intersect_filter_includes(a, b) { return a.filter(el => b.includes(el)); } function intersect_filter_has_this(a, b) { return a.filter(Set.prototype.has, new Set(b)); } function intersect_filter_has_arrow(a, b) { const set = new Set(b); return a.filter(el => set.has(el)); } function intersect_for_has(a, b) { const result = []; const set = new Set(b); for (let i = 0, length = a.length; i < length; ++i) { if (set.has(a[i])) result.push(a[i]); } return result; }

Firefox 53的结果:

Ops/sec on large arrays (10,000 elements): filter + has (this) 523 (this answer) for + has 482 for-loop + in 279 filter + in 242 for-loops 24 filter + includes 14 filter + indexOf 10 Ops/sec on small arrays (100 elements): for-loop + in 384,426 filter + in 192,066 for-loops 159,137 filter + includes 104,068 filter + indexOf 71,598 filter + has (this) 43,531 (this answer) filter + has (arrow function) 35,588

我使用地图甚至对象可以使用。

//find intersection of 2 arrs
const intersections = (arr1,arr2) => {
  let arrf = arr1.concat(arr2)
  let map = new Map();
  let union = [];
  for(let i=0; i<arrf.length; i++){
    if(map.get(arrf[i])){
      map.set(arrf[i],false);
    }else{
      map.set(arrf[i],true);
    }
  }
 map.forEach((v,k)=>{if(!v){union.push(k);}})
 return union;
}