How to simplify judgment by js

This article mainly introduces how to simplify the judgment of js, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

Judgment simplification

If there is a judgment like this:

If (undefined = null) {/ /.}

You can use arrays to simplify this judgment logic:

If ([undefined, 10, 15, null] .declare (a)) {/ /.}

In this way, the code will be much simpler and easy to expand, and if you still need to determine that it is equal to a, you can add it directly to the array.

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