What are the common ways to pass extra parameters when form is submitted

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When submitting a form, you will encounter the situation of adding additional parameters before submitting, and there are several solutions to this:

1. Use hidden's input in the form and put the parameters in it.

Cons: some input nodes are added to the form form, which makes it uncomfortable.

two。 Use javascript to dynamically add input to the form before submitting.

Cons: need to write scripts.

3. Use ajax to submit splicing parameters.

Cons: if there is a file in the form that needs to be uploaded, it won't work.

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