Javascript overwrite and reload function _ javascript skills

Those who have learned JAVA are certainly not familiar with function coverage and overloading. Those who have learned JAVA are certainly not familiar with function coverage and overloading.
Overload refers to the parameter type of two or more functions. The order, quantity, and return values are different.
Override refers to the parameter types of two or more functions. The order, quantity, and return values are exactly the same.
Does javascript really have this feature?
The answer is that function names in Javascript only use the last definition.
First, let's look at the following code:

The Code is as follows:

New Document