在此页

• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

XMLHttpRequest upload property returns an XMLHttpRequestUpload object that can be observed to monitor an upload's progress. It is an opaque object, but because it's also an XMLHttpRequestEventTarget , event listeners can be attached to track its process.

The following events can be triggered on an upload object and used to monitor the upload:

事件	Event listener	描述
loadstart	onloadstart	The upload has begun.
progress	onprogress	Periodically delivered to indicate the amount of progress made so far.
abort	onabort	The upload operation was aborted.
error	onerror	The upload failed due to an error.
load	onload	The upload completed successfully.
timeout	ontimeout	The upload timed out because a reply did not arrive within the time interval specified by the XMLHttpRequest.timeout .
loadend	onloadend	The upload finished. This event does not differentiate between success or failure, and is sent at the end of the upload regardless of the outcome. Prior to this event, one of load , error , abort ，或 timeout will already have been delivered to indicate why the upload ended.

规范

规范	状态	注释
XMLHttpRequest	实时标准	WHATWG (Web 超文本应用程序技术工作组) 实时标准

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
upload	Chrome 1	Edge 12	Firefox Yes	IE 10	Opera Yes	Safari 10	WebView Android Yes	Chrome Android 18	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android 1.0

图例

完整支持

完整支持

另请参阅

• 使用 XMLHttpRequest
• FileHandle API
• 文件和目录条目 API

元数据

• 最后修改： Dec 19, 2019

相关话题

1. XMLHttpRequest
2. 构造函数

   1. XMLHttpRequest()
3. 特性

   1. channel
   2. mozAnon
   3. mozBackgroundRequest
   4. mozResponseArrayBuffer
   5. mozSystem
   6. multipart
   7. onreadystatechange
   8. readyState
   9. response
   10. responseText
   11. responseType
   12. responseURL
   13. responseXML
   14. status
   15. statusText
   16. timeout
   17. upload
   18. withCredentials
4. 方法

   1. abort()
   2. getAllResponseHeaders()
   3. getResponseHeader()
   4. open()
   5. openRequest()
   6. overrideMimeType()
   7. send()
   8. sendAsBinary()
   9. setRequestHeader()
5. 事件

   1. onreadystatechange
   2. abort
   3. error
   4. load
   5. loadend
   6. loadstart
   7. progress
   8. timeout
6. 继承：

   1. XMLHttpRequestEventTarget
   2. EventTarget
7. XMLHttpRequest 相关页面

   1. FormData
   2. XMLHttpRequestEventTarget
   3. XMLHttpRequestUpload