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• 范例
• 规范
• 浏览器兼容性
• 相关话题

XMLHttpRequest.timeout property is an unsigned long representing the number of milliseconds a request can take before automatically being terminated. The default value is 0, which means there is no timeout. Timeout shouldn't be used for synchronous XMLHttpRequests requests used in a document environment or it will throw an InvalidAccessError exception. When a timeout happens, a timeout event is fired.

注意： You may not use a timeout for synchronous requests with an owning window.

Using a timeout with an asynchronous request

In Internet Explorer, the timeout property may be set only after calling the open() method and before calling the send() 方法。

范例

var xhr = new XMLHttpRequest();
xhr.open('GET', '/server', true);
xhr.timeout = 2000; // time in milliseconds
xhr.onload = function () {
  // Request finished. Do processing here.
};
xhr.ontimeout = function (e) {
  // XMLHttpRequest timed out. Do something here.
};
xhr.send(null);
					

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
timeout	Chrome 29	Edge 12	Firefox 12	IE 8	Opera 17 17 不支持 12 — 16	Safari 6.1	WebView Android ≤37	Chrome Android 29	Firefox Android 14	Opera Android 18 18 不支持 12 — 16	Safari iOS 7	Samsung Internet Android 2.0

图例

完整支持

完整支持

元数据

• 最后修改： 2019 年 3 月 23 日

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