How JavaScript detects and restricts the number of check boxes _javascript tips

This example describes how JavaScript detects and restricts the number of check boxes. Share to everyone for your reference. Specifically as follows:

Here use JavaScript to determine whether the check box is checked, and you can limit the number of check box, this is a more practical JS form judgment example, check box is selected to let a lot of people wonder, now good, this piece of code to help you solve the problem.

The screenshot of the running effect is as follows:

The specific code is as follows:

I hope this article will help you with your JavaScript programming.