Ajax Error Handling net::err_connection_refused

When requesting the server to stop, the browser prompts net::err_connection_refused

jquery Event Three callback events: Success success error complete as long as the request completes, whether the return succeeds or fails

Try to catch this kind of error, tested, it will appear in the error logic, the error callback function has three parameters (XHR object, error information, exception object)

In this case, XHR's two state values are 0, and the second argument returns an "error" string

(PS. See other people's blogs have to say now success logic, but I test not so ... ）

BTW, set the AJAX global configuration in the project, only when the single case does not have this configuration option to take effect, such as you in the business of an AJAX request in an error capture callback, then the global capture is not in effect on it, so the best single case of set and only set success Handler