https://developer.mozilla.org/zh-CN/docs/AJAX
https://developer.mozilla.org/zh-CN/docs/AJAX/Getting_Started
https://developer.mozilla.org/zh-CN/docs/Web/API/XMLHttpRequest
https://developer.mozilla.org/zh-CN/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest
https://developer.mozilla.org/zh-CN/docs/Web/API/GlobalFetch/fetch
https://developer.mozilla.org/zh-CN/docs/Web/API/Worker
https://developer.mozilla.org/zh-CN/docs/Server-sent_events/Using_server-sent_events
Using_XMLHttpRequest
https://developer.mozilla.org/zh-CN/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest
https://www.w3.org/TR/XMLHttpRequest2/#the-responsetype-attribute
https://xhr.spec.whatwg.org/
https://developer.mozilla.org/zh-CN/docs/Web/API/FormData
https://developer.mozilla.org/zh-CN/docs/Web/API/FormData/Using_FormData_Objects
https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Access_control_CORS