Run JavaScript after page loads

Many things happen on page after $(document).ready(). SharePoint 2013 does provide a few options to execute JavaScript function after page loads.

1. Script on Demand (load a .js file then execute you code):

   function stuffThatRequiresSP_JS(){
       //your code
   }
   SP.SOD.executeFunc("sp.js", stuffThatRequiresSP_JS) ;
   

2. Delay until loaded (wait for a .js file to load, then run):

   function stuffToRunAfterSP_JS(){
       //your code
   }
   ExecuteOrDelayUntilScriptLoaded(stuffToRunAfterSP_JS, "sp.js");
   

3. Run function after other stuff finishes loading:

   function runAfterEverythingElse(){
       // your code
   }
    _spBodyOnLoadFunctionNames.push("runAfterEverythingElse");
   

Sources:

1. executeFunc: http://msdn.microsoft.com/en-us/library/ff409592(v=office.14).aspx

2. ExecuteOrDelayUntilScriptLoaded: http://msdn.microsoft.com/en-us/library/ff411788(v=office.14).aspx

3. For _spBodyOnLoadFunctionNames: source