Javascript Equivalent to PHP Explode

Question

I have this string:

0000000020C90037:TEMP:data

I need this string:

TEMP:data.

With PHP I would do this:

$str = '0000000020C90037:TEMP:data';
$arr = explode(':', $str);
$var = $arr[1].':'.$arr[2];

How do I effectively explode a string in JavaScript the way it works in PHP?