在此页

• 句法
• 非标 Firefox 句法
• 另请参阅
• 相关话题

草案
此页面不完整。

XMLHttpRequest() 构造函数创建新 XMLHttpRequest .

对于细节关于如何使用 XMLHttpRequest ，见 使用 XMLHttpRequest .

句法

const request = new XMLHttpRequest();
					

参数

None.

返回值

新的 XMLHttpRequest object. The object must be prepared by at least calling open() to initialize it before calling send() to send the request to the server.

非标 Firefox 句法

Firefox 16 added a non-standard parameter to the constructor that can enable anonymous mode (see bug 692677 ). Setting the mozAnon flag to true effectively resembles the AnonXMLHttpRequest() constructor described in older versions of the XMLHttpRequest specification.

const request = new XMLHttpRequest(paramsDictionary);
					

参数 (非标)

objParameters

There are two flags you can set:

mozAnon

Boolean: Setting this flag to true will cause the browser not to expose the origin and user credentials when fetching resources. Most important, this means that Cookie will not be sent unless explicitly added using setRequestHeader.

mozSystem

Boolean: Setting this flag to true allows making cross-site connections without requiring the server to opt-in using CORS . Requires setting mozAnon: true , i.e. this can't be combined with sending cookies or other user credentials. This only works in privileged (reviewed) apps ( bug 692677 ); it does not work on arbitrary webpages loaded in Firefox

另请参阅

• 使用 XMLHttpRequest
• HTML 在 XMLHttpRequest

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. 继承：

   1. XMLHttpRequestEventTarget
   2. EventTarget
6. 事件

   1. loadstart
   2. progress
   3. abort
   4. error
   5. load
   6. timeout
   7. loadend
   8. readystatechange
7. XMLHttpRequest 相关页面

   1. FormData
   2. XMLHttpRequestEventTarget
   3. XMLHttpRequestUpload