Use JavaScript's classlist instead of JQuery's class operation

JavaScript's classname operation method is uncomfortable, he gets a continuous string

Must be split apart with split, so many people want to use jquery Addclass,removeclass,hasclass and so on.

Classlist solves this problem, although compatibility is not good. But it's going to be better, let's learn first.

HtmlElement will have classlist properties,

The main methods are as follows:

El.classList.add ()

El.classList.remove ()

El.classList.contain ()

El.classList.toggle ()

Try it out, it's easy, it's going to be a lot less dependent on jquery. La La la

Use JavaScript's classlist instead of JQuery's class operation