Ajax submission 400 error in SpringMVC

There are three situations for 400 errors

1: The amount of data requested is too large, but this situation is generally very Rare.

2: The requested url is incorrectly entered , please check whether the url is correct.

3: The requested data parameter is incorrect, make sure that every parameter can be requested.

Note: Xiaobai had a 400 error before, and the parameter obtained in the background was null because of the third situation. After checking the parameters one by one (the method is a bit stupid), it turned out that the 'time' was obtained 'There is a problem with the parameters

If there are comrades in the same situation as me, you can try to remove the "time" parameter and try to get it, or add it in js The obtained js object is converted into a date object for request.

##JS：

HTML：

ajax：

Solution: Convert the object into a date object

##You can see it in the background

The object has been caught, and it’s up to you to do the rest. hey-hey

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