「JavaScript」concat()で配列の連結方法

JSコード:
<script type=”text/javascript”>

var arr = new Array(3)

arr[0] = “Tom”

arr[1] = “John”

arr[2] = “Lucy”

var arr2 = new Array(3)

arr2[0] = “James”

arr2[1] = “Adrew”

arr2[2] = “Martin”

document.write(arr.concat(arr2))

</script>
結果
Tom,John,Lucy,James,Adrew,Martin