Why can the anonymous functions of JQ access the methods inside

1.jQuery All methods of are based on jQuery object （ namely $ ）, Native js Objects are inaccessible . When you use jQuery Object time , It will take the one you choose DOM Object instantiates a jQuery object , And then call jQuery Method . then jQuery Then put your choice jQuery Methods translate into native DOM Method to execute . about jQuery, There is only one so-called overall situation ： namely jQuery object （ Alias $）, There are no other global variables or methods .

2.jQuery The last part of the source code , Write directly to window On , It becomes a global variable ！

window.jQuery=window.$=jQuery;

Instantiation ：

js in , The process of creating objects with classes is often called instantiation , Instantiating an object is the process of creating an object .“ class ” It is abstract. , There is no way to manipulate it or use its methods and properties , Only instantiate this class into an object , Before you can call its series of methods and properties ; therefore , Instantiating an object is the process from abstraction to concrete .