补充:fetch不支持上传进度跟踪。
相关参考:https://juejin.cn/post/7090890245238947848
- xmlhttprequest fetchxmlhttprequest fetch xmlhttprequest xmlhttprequest步骤 origin 39 xmlhttprequest supported 39 access access-control-allow-origin xmlhttprequest xmlhttprequest对象ajax 39 xmlhttprequest responsetext property xmlhttprequest prototype delegate rewrite xmlhttprequest access问题to xmlhttprequest websocket