Java script is native to all browsers. You may have it disabled. You will have to go into your browsers settings and enable java script within your browser. If you have any plugins such as "No Script" then you will need to disable them or uninstall them for Java script to work properly again.
If you meant to ask how to download Java (it is different than java script) then you would visit http://www.java.com and download the software and install.
Seeing as you posted this as a Facebook problem I would be satisfied to say that your problem is java script is disabled in your browser settings.
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