xmlhttp状态码

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xmlhttp状态码
当没有通过服务器建立xmlhttp时，xmlhttp.status返回0则是响应成功，否则是返回200是通过服务器响应成功。

其它返回值：

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