Js-$.extend extension method makes method parameters more flexible_javascript skills

When doing JS development, we encapsulate complex third-party plug-ins and then expose a very simple method interface to the outside world. This is a commonly used method during development. In JS, our method parameters usually use JQ’s $.extend extension. Method to implement

That is, it only modifies the value of the specified attribute, and other values ​​of the object remain at their original default values.
The || operator in JS has the same function as the || , this function is similar to

in C#? ? operator, so || in JS is quite powerful, haha.