一、ES5

1，直接使用 filter、concat 來計算

 1 var a = [1,2,3,4,5]
 2 var b = [2,4,6,8,10]
 3 //交集
 4 var c = a.filter(function(v){ return b.indexOf(v) > -1 })
 5 //差集
 6 var d = a.filter(function(v){ return b.indexOf(v) == -1 })
 7 //補集
 8 var e = a.filter(function(v){ return !(b.indexOf(v) > -1) })
 9  .concat(b.filter(function
 
(v){ return !(a.indexOf(v) > -1)}))
10 //並集
11 var f = a.concat(b.filter(function(v){ return !(a.indexOf(v) > -1)}));
12 console.log("陣列a：", a);
13 console.log("陣列b：", b);
14 console.log("a與b的交集：", c);
15 console.log("a與b的差集：", d);
16 console.log("a與b的補集：", e);
17 console.log("a與b的並集：", f);

2，對 Array 進行擴充套件

 1 //陣列功能擴充套件
 2 //陣列迭代函式
 3 Array.prototype.each = function(fn){
 4  fn = fn || Function.K;
 5  var a = [];
 6  var args = Array.prototype.slice.call(arguments, 1);
 7  for(var i = 0; i < this.length; i++){
 8  var res = fn.apply(this,[this[i],i].concat(args));
 9  if(res != null) a.push(res);
10  }
 
11  return a;
12 };
13 //陣列是否包含指定元素
14 Array.prototype.contains = function(suArr){
15  for(var i = 0; i < this.length; i ++){
16  if(this[i] == suArr){
17  return true;
18  }
19  }
20  return false;
21 }
22 //不重複元素構成的陣列
23 Array.prototype.uniquelize = function(){
24  var ra = new Array();
25  for(var i = 0; i < this.length; i ++){
26  if(!ra.contains(this[i])){
27  ra.push(this[i]);
28  }
29  }
30  return ra;
31 };
32 //兩個陣列的交集
33 Array.intersect = function(a, b){
34  return a.uniquelize().each(function(o){return b.contains(o) ? o : null});
35 };
36 //兩個陣列的差集
37 Array.minus = function(a, b){
38  return a.uniquelize().each(function(o){return b.contains(o) ? null : o});
39 };
40 //兩個陣列的補集
41 Array.complement = function(a, b){
42  return Array.minus(Array.union(a, b),Array.intersect(a, b));
43 };
44 //兩個陣列並集
45 Array.union = function(a, b){
46  return a.concat(b).uniquelize();
47 };
48 //使用
49 var a = [1,2,3,4,5]
50 var b = [2,4,6,8,10]
51 console.log("陣列a：", a);
52 console.log("陣列b：", b);
53 console.log("a與b的交集：", Array.intersect(a, b));
54 console.log("a與b的差集：", Array.minus(a, b));
55 console.log("a與b的補集：", Array.complement(a, b));
56 console.log("a與b的並集：", Array.union(a, b));

二、ES6

 1 var a = [1,2,3,4,5]
 2 var b = [2,4,6,8,10]
 3 console.log("陣列a：", a);
 4 console.log("陣列b：", b);
 5 var sa = new Set(a);
 6 var sb = new Set(b);
 7 // 交集
 8 let intersect = a.filter(x => sb.has(x));
 9 // 差集
10 let minus = a.filter(x => !sb.has(x));
11 // 補集
12 let complement = [...a.filter(x => !sb.has(x)), ...b.filter(x => !sa.has(x))];
13 // 並集
14 let unionSet = Array.from(new Set([...a, ...b]));
15 console.log("a與b的交集：", intersect);
16 console.log("a與b的差集：", minus);
17 console.log("a與b的補集：", complement);
18 console.log("a與b的並集：", unionSet);

三、Jquery

 1 var a = [1,2,3,4,5]
 2 var b = [2,4,6,8,10]
 3 console.log("陣列a：", a);
 4 console.log("陣列b：", b);
 5 // 交集
 6 let intersect = $(a).filter(b).toArray();
 7 // 差集
 8 let minus = $(a).not(b).toArray();
 9 // 補集
10 let complement = $(a).not(b).toArray().concat($(b).not(a).toArray());
11 // 並集
12 let unionSet = $.unique(a.concat(b));
13 console.log("a與b的交集：", intersect);
14 console.log("a與b的差集：", minus);
15 console.log("a與b的補集：", complement);
16 console.log("a與b的並集：", unionSet);