<!DOCTYPE html>
<html>
<body>
<p>We will see after clicking the button how two array will join</p>
<button onclick="concateTwoArray()" id="btnClick">Click</button>
<p id="pId"></p>
<script>
function concateTwoArray() {
var twoDay= ["Sunday", "Monday"];
var fiveDay= ["Tuesday", "Wednsday","Thursday", "Friday","Saturday"];
var totalDay = twoDay.concat(fiveDay);
document.getElementById("pId").innerHTML = totalDay ;
}
</script>
</body>
</html>