Failed to load resource: the server responded with a status of 503 (Service Unavailable)

If the corresponding JS reference is correct, a refresh will work fine
When you visit a web page, load a blank, and view a development script, you find a bunch of errors
Failed to load resource: the server responded with a status of 503 (Service Unavailable)

When switching to sources, it is found that the corresponding JS file has not been loaded

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