JavaScript and jquey realize the merging operation of multiple arrays_javascript skills

1. Native JavaScript implementation

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

I want to merge it into something like this:

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

Can be used

arr1.concat(arr2);

2. Jquery implementation

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