How to use "join()" to create a string from an array using JavaScript?

"join" concatenates the array elements with a specified seperator between them.

<script type="text/javascript">

var days = ["Sunday","Monday","Tuesday","Wednesday", "Thursday","Friday","Saturday"];

document.write("days:"+days.join(","));

</script>

This produces

days:Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday