去重，用js去两组数的重数

    var arr1 = [2, 44, 8, 23, 13, 5]   
          var arr2 = [2, 64, 38, 73, 13, 5] 
        var arr = arr1.concat(arr2);
        console.log(all);
            var dtr = []
            for( var i=0 ; i<arr.length;i++){
                for (var j = i+1; j < arr.length; j++) {
                    if (arr[i] == arr[j]) {
                        dtr.push(arr[i]);
                        arr.splice(j,1);
                    
                    }
                }
            }
            console.log(arr);
            console.log(dtr);

把两组数合成一组在去除重护的数字

        const set1 = new Set([1, 2, 3, 4]);
        const set2 = new Set([3, 4, 5, 6]);
        let union1 = new Set([...set1, ...set2])
           console.log(union1)