js 查找數組在另外一個數組中不重復項

var arr2 = [0,4,6,1,3,9];
		function getArrDifference(arr1, arr2) {
			console.log(arr1.concat(arr2))
		var add=arr1.concat(arr2).filter(function(v, i, arr) {
			console.log(arr.indexOf(v))
			console.log(arr.lastIndexOf(v))
			return arr.indexOf(v) === arr.lastIndexOf(v);
			});
		console.log(add)
		return add
		}
		console.log(getArrDifference(arr1,arr2)) //[2, 5, 6, 9]