Vue-resource the reason for requesting PHP data to fail

When writing a Vue project, it was found that when using Vue-resource's Post method to request PHP data, there was no response at all, and the data was not known without the configuration parameters:

{  Emulatejson:true  }

The meaning of this configuration parameter is:

When set to true, the request body is sent as application/x-www-form-urlencoded, which is equivalent to the form submission. At this point, the header in HTTP Content-type is application/x-www-form-urlencoded. Often used when Application/json encoding is not used on the server side.

Vue-resource the reason for requesting PHP data to fail