JS实现合并两个数组并去除重复项只留一个的方法

//It's merge arr1 and arr2 , delete the same element only leave one//It's only apdapter array. If object, no. //The sequence of the two array is not required.mergeArray:function (arr1, arr2){  for (var i = 0 ; i < arr1.length ; i ++ ){   for(var j = 0 ; j < arr2.length ; j ++ ){    if (arr1[i] === arr2[j]){     arr1.splice(i,1); //利用splice函数删除元素，从第i个位置，截取长度为1的元素    }   } } //alert(arr1.length) for(var i = 0; i <arr2.length; i++){  arr1.push(arr2[i]); } return arr1;}