jQuery $.extend() usage summary

This article mainly introduces the usage of jQuery $.extend(). Friends who need it can refer to it

jQuery provides two methods for developing plug-ins, which are:
jQuery.fn.extend(object);

jQuery.extend(object);
jQuery.extend(object); To extend the jQuery class itself. Add new methods to the class.
jQuery.fn.extend(object); Add methods to jQuery objects. This should be easy to understand. for example.

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