status狀態值
長整形標準http狀態碼，定義如下： 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

readyState的狀態值
0 (未初始化) 對象已建立，但是尚未初始化（尚未調用open方法）
1 (初始化) 對象已建立，尚未調用send方法
2 (發送數據) send方法已調用，但是當前的狀態及http頭未知
3 (數據傳送中) 已接收部分數據，因為響應及http頭不全，這時通過responseBody和responseText獲取部分數據會出現錯誤，
4 (完成) 數據接收完畢,此時可以通過通過responseBody和responseText獲取完整的回應數據