jsp: Failed to load resource: the server responded with a status of 400 (Bad Request)

1. First, debug JS in the foreground to see whether $. Ajax can send the request; if the request is received in the background, debug whether it is an entity or other methods.
2. If the foreground cannot send the request, see if it is a problem with JS’s validate validation, as well as js’s dataPicker time plug-in assignment and other required data validation issuesLike friends can scan my personal public account, there are good things to share with. Free access to a variety of learning video, source code, PPT materials
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