spBodyOnLoadFunctionNames in SharePoint

_spBodyOnLoadFunctionNames.push() is SharePoint's version of jQuery's $(document).ready() function.It takes the function names as  a string parameter.

 

For Example

 

 _spBodyOnLoadFunctionNames.push('HidepromotedResults');

function HidepromotedResults()
{
     document.getElementById(‘ctl00_fullscreenmodeBtn‘).style.visibility = ‘hidden’;
}