JS implementation text box input text number limit code _javascript skills

Usually, the text box entered the number of words is not unlimited, generally will be limited to a maximum input, the more humane site may have input words inverted effect, such as the remaining 20 can enter such a hint, the following is an example to introduce how to achieve this effect.

First look at the effect chart:

The code is as follows:

Hopefully this article will help you learn about JavaScript programming.