How to use JS to find the difference between arrays

This article mainly introduces how to use JS to find the difference set of arrays. It has a certain reference value. Now I share it with you. Friends in need can refer to it

The first one: If not Considering the compatibility of IE8, Foreach can be used. This method finds the difference set of arr1 minus arr2.

arr1 = [1,2,3,4];
arr2 = [1,2,3];  
 subSet =  set2 =  subset = (!

The second is to use JQ's merge and The use of grep to find the difference set is compatible with mainstream browsers such as IE8 and chrome.

 alpha = [1, 2, 3, 4= [1，2，3=  $.merge($.grep(a,  $.inArray(i, b) == -1 $.inArray(i, a) == -1&& console.log( $.arrayIntersect(alpha, beta) );
//结果等于4

The third method using the ES6 set method is similar to the foreach method

var subSet = function(arr1, arr2) {    
var set1 = new Set(arr1);    
var set2 = new Set(arr2);    
var subset = [];    
for (let item of set1) {        
if (!set2.has(item)) {
            subset.push(item);
        }
    }    return subset;
};

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