JQuery $.extend () usage

$.extend () Usage Summary.
jquery has two methods for developing plug-ins, namely:
JQuery.fn.extend (object);

Jquery.extend (object);

Jquery.extend (object); To extend the JQuery class itself. Adds a new method to the class.
JQuery.fn.extend (object); Adds a method to a jquery object. This should be very well understood. Let me give you an example.

< Span style= "FONT-SIZE:18PX;" >

OK, so you see a little bit of $.extend () usage. 

1. Merge multiple objects.

This is where $.extend () is used to nest multiple objects.
The so-called nested multiple objects, a bit similar to the merging of arrays of operations.
But here is the object. An example is described.
<span style= "FONT-SIZE:18PX;" >//usage: jquery.extend (obj1,obj2,obj3,..) var css1={size: "10px", Style: "Oblique"}var css2={size: "12px", Style: "Oblique", Weight: "Bolder"}$.jquery.extend (Css1 , CSS2)//Result: The Size property of Css1 is overridden and inherits the weight attribute of Css2//Css1 = {size: "12px", Style: "Oblique", Weight: "Bolder"}</span>

2. Deep nested objects.

<span style= "FONT-SIZE:18PX;"  >  jquery.extend (       {name: ' John ', Location: ' City: ' Boston '}},       {last: ' Resig ', location: ' {state: ' MA '} }     );      Result:      //+ = {name: ' John ', Last: ' Resig ', location: {state: ' MA '}}//New deeper. Extend ()     Jquery.extend (True     {name: ' John ', location: {city: ' Boston '}},       {last: ' Resig ', location: {state: ' MA '}}    );    Result     //+ = {name: ' John ', Last: ' Resig ',    //location      : {city: ' Boston ', State: ' MA '}}  </span >

3. You can add static methods to jquery. 

<span style= "FONT-SIZE:18PX;" >
Best Wishes