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The example explains how to verify whether the form item is empty in js, and the example describes js

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The example explains how to verify whether the form item is empty in js, and the example describes js

Form verification is essential for almost every website that needs to be registered or logged on. Some verification is very complicated and can be said to be a variety of requirements for you, however, this section only describes the simplest verification method in the form, that is, to determine whether it is null. Some websites with low requirements have already met this requirement.
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