Allows you to bind a function to be executed when the DOM document has finished  loading. This function behaves just like $(document).ready(), in that it should  be used to wrap other $() operations on your page that depend on the DOM being  ready to be operated on. While this function is, technically, chainable - there  really isn't much use for chaining against it. You can have as many  $(document).ready events on your page as you like. See ready(Function) for  details about the ready event.
Function callback :  The function to execute when the DOM is ready. 
Example:
 
Executes the function when the DOM is ready to be used.
$(function()
{ 
   // Document is ready
 });
Example:
Uses both the shortcut for $(document).ready() and the argument  to write failsafe jQuery code using the $ alias, without relying on the global  alias.
jQuery(function($) {
// Your code using failsafe $ alias here... });
 
 
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