whether to use the Fetch API or XHR based on browser support（根据浏览器是否支持fetch API 优先使用fetch来实现请求）

[manbill]

Is your feature request related to a problem? Please describe.

Recently, when using a service worker to listen for fetch events for cache handling, I found that the fetch events were not being triggered. I suspect this may be due to Axios exclusively using XMLHttpRequest (XHR) requests. I hope to prioritize checking whether fetch is supported before using it for requests.
最近使用service-worker 监听fetch事件来处理缓存，发现无法触发fetch事件，猜测是axios全部是xhr请求导致。希望能优先判断是否支持fetch来使用fetch请求

Describe the solution you'd like

I hope to prioritize checking whether fetch is supported before using it for requests
希望能优先判断是否支持fetch来使用fetch请求

Describe alternatives you've considered

No response

Additional context/Screenshots

No response