How does javascript understand the following?

(obj.inner.print) () and (obj.inner.print = obj.inner.print) ()) how to understand? 

var num = 10;
var obj = {
    num:8,
    inner: {
        num: 6,
        print: function () {
            console.log(this.num);
        }
    }
}
num = 888;
obj.inner.print(); // 6
var fn = obj.inner.print;
fn(); //888
(obj.inner.print)(); //6
(obj.inner.print = obj.inner.print)(); //888
Javascript
Feb.28,2021 
(obj.inner.print)()

is actually

. 
obj.inner.print()

and 

(obj.inner.print = obj.inner.print)()

is an assignment operation, returns a function, and then calls this function

the first is to run the function, (function) (), runs the anonymous function itself. The second one you can imagine is that you eat drumsticks. You take drumsticks in your left hand and replace them with your right hand.

Previous: Cnpm installation of webpack has the following problems, how to configure webpack

Next: I write this about why the PHP background interface can only return one piece of data to the database. I want to return all the data that matches the uphonenumber.

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e59d77-45560.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e59d77-45560.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?