About XMLHttpRequest Object

XMLHttpRequest 对象

属性列表

属性	描述
onreadystatechange	Sets or retrieves the event handler for asynchronous requests.
readyState	Retrieves the current state of the request operation.(查看)
responseBody	Retrieves the response body as an array of unsigned bytes.
responseText	Retrieves the response body as a string.
responseXML	Retrieves the response body as an XML Document Object Model (DOM) object.
status	Retrieves the HTTP status code of the request.(查看)
statusText	Retrieves the friendly HTTP status of the request.

方法列表

方法	描述
abort	Cancels the current HTTP request.
getAllResponseHeaders	Returns the complete list of response headers.
getResponseHeader	Returns the specified response header.
open	Assigns method, destination URL, and other optional attributes of a pending request.
send	Sends an HTTP request to the server and receives a response.
setRequestHeader	Adds custom HTTP headers to the request.

请求操作的当前状态

(0)UNINITIALIZED	The object has been created, but not initialized (the open method has not been called).
(1) LOADING	The object has been created, but the send method has not been called.
(2) LOADED	The send method has been called, but the status and headers are not yet available.
(3) INTERACTIVE	Some data has been received. Calling the responseBody and responseText properties at this state to obtain partial results will return an error, because status and response headers are not fully available.
(4) COMPLETED	All the data has been received, and the complete data is available in the responseBody and responseText properties.

HTTP请求的状态码

Number	Description
100	Continue
101	Switching protocols
200	OK
201	Created
202	Accepted
203	Non-Authoritative Information
204	No Content
205	Reset Content
206	Partial Content
300	Multiple Choices
301	Moved Permanently
302	Found
303	See Other
304	Not Modified
305	Use Proxy
307	Temporary Redirect
400	Bad Request
401	Unauthorized
402	Payment Required
403	Forbidden
404	Not Found
405	Method Not Allowed
406	Not Acceptable
407	Proxy Authentication Required
408	Request Timeout
409	Conflict
410	Gone
411	Length Required
412	Precondition Failed
413	Request Entity Too Large
414	Request-URI Too Long
415	Unsupported Media Type
416	Requested Range Not Suitable
417	Expectation Failed
500	Internal Server Error
501	Not Implemented
502	Bad Gateway
503	Service Unavailable
504	Gateway Timeout
505	HTTP Version Not Supported