JavaScript and jquey implement the merge operation of multiple arrays

1. Native JavaScript implementation

 var array1 = ["a", "b"];var array2 = ["c", "d"];

I want to merge and become like this:

 <span style="font-weight:bold">var</span> <span style="font-weight:bold">array</span>= [<span style="color:rgb(221,17,68)">"a"</span>, <span style="color:rgb(221,17,68)">"b"</span>, <span style="color:rgb(221,17,68)">"c"</span>, <span style="color:rgb(221,17,68)">"d"</span>];

Available

 arr1.concat(arr2);

2. Jquery implementation

 $.merge(array1,array2); console.log($.unique(array1));