fetch 报错 Failed to execute 'fetch' on 'Window': Request with GET/HEAD method cannot have body.

No, there isn‘t.

GET requests can‘t have a request body, you can‘t make them have one. GET requests only retrieve data, they never send data.

An API that requires GET request with empty object as a body just doesn‘t work.

Edit:

Apparently, GET requests are allowed to have a body. Most implementations will ignore it or reject the request. But even if the server that provides your API allows a body, you can‘t use it:

From the spec about XMLHttpRequest#send:

Initiates the request. The optional argument provides the request entity body. The argument is ignored if request method is GET or HEAD. Throws an "InvalidStateError" exception if the state is not OPENED or if the send() flag is set.

From the spec about the Request class in the fetch API:

If either init’s body member is present and is non-null or inputBody is non-null, and request’s method is GET or HEAD, then throw a TypeError.

That means that the answer to your question is still No.