Useful JavaScript global variables in SharePoint

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If you’re using custom JavaScripts with SharePoint 2010 some global JavaScript variables may come in handy.
These variables work if you’re using SharePoint’s default or any other custom master page. 

L_Menu_BaseUrl – the base URL of the site / subsite. Very useful when you need to determine the absolute path of the site in JavaScript. Example: document.location = L_Menu_BaseUrl + ‘lists/calendar/allitems.aspx’ //redirects to Calendar list 

L_Menu_LCID – the LCID of the site you’re in. Useful if you need to determine the language of the site. The list of Locale IDs can be found here. 

_spUserId – the ID of the logged in user.

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