Ajax中onreadystatechange返回的状态
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100:Continue101:Switching protocols200:OK201:Created202:Accepted203:Non-Authoritative Information204:No Content205:Reset Content206:Partial Content300:Multiple Choices301:Moved Permanently302:Found303:See Other304:Not Modified305:Use Proxy307:Temporary Redirect400:Bad Request401:Unauthorized402:Payment Required403:Forbidden404:Not Found405:Method Not Allowed?406:Not Acceptable407:Proxy Authentication Required408:Request Timeout409:Conflict410:Gone411:Length Required412:Precondition Failed413:Request Entity Too Large414:Request-URI Too Long415:Unsupported Media Type?416:Requested Range Not Suitable?417:Expectation Failed?500:Internal Server Error?501:Not Implemented502:Bad Gateway503:Service Unavailable504:Gateway Timeout?505:HTTP Version Not Supported