javascript - React with fetch error reporting problem

Question

I was doing a test, and then used fetch to make the interface, and then an error was reported. . . .

#There is definitely a request on the backend. It seems to be a cross-domain problem. Please find a solution! Thanks.

Answer 1

It’s a cross-domain issue. If this is just a development environment and you want to deploy it to the server in the future, you can just set the chrome browser to allow cross-domain --disable-web-security --user-data-dir right-click shortcut Method, add this after the target.
If not, ask the backend to open a cross-domain one for you

Open this picture and you’ll be good to go