Shulou(Shulou.com)06/03 Report--

Good programmer web front-end learning route sharing AJAX status code ajax.status and encapsulation, AJAX status code description

1 reply: request received, continue processing

2customers: operation received successfully, analyzed and accepted

3 requests: the completion of this request must be further processed

4 invalid requests: the request contains an error syntax or cannot be completed

5 invalid request: the server failed to execute a fully valid request

100buy-the customer must continue to make requests

101Mel-the customer requires the server to convert the HTTP protocol version according to the request

200Mutual-deal succeeded

201Mui-prompt to know the URL of the new file

202 color-accept and process, but processing is not completed

203mer-the return information is uncertain or incomplete

204music-request received, but the return message is empty

205Mel-the server has completed the request, and the user agent must reset the currently browsed file

206Mel-the server has completed the GET requests of some users

300mura-requested resources are available in multiple places

301mer-Delete request data

302mi-request data was found at another address

303mer-customers are advised to visit other URL or access methods

304Mel-the client has executed GET, but the file has not changed

305music-the requested resource must be obtained from the address specified by the server

306Mel-the code used in the previous version of HTTP, no longer used in the current version

307 music-declare that the requested resource is temporarily deleted

400m-incorrect request, such as syntax error

401 color-request for authorization failed

402 color-keep valid Chargeto header response

403muri-request not allowed

404Mel-No files, queries, or URl found

405Mel-the method defined by the user in the Request-Line field is not allowed

406Mel-the requested resource is inaccessible based on the Accept sent by the user

407 Mel-similar to 401, users must first be authorized on the proxy server

408Mel-the client did not complete the request within the hungry time specified by the user

409 color-the request could not be completed for the current resource status

410Mel-this resource is no longer available on the server and there is no further reference address

411Mel-the server rejects a user-defined request for Content-Length attributes

412Mel-one or more request header fields are incorrect in the current request

413Mel-the requested resource is larger than the size allowed by the server

414Mel-the requested resource URL is longer than the length allowed by the server

415Mel-request resource does not support request project format

416 range-the request contains the Range request header field, there is no range indication value within the scope of the current request resource, and the request does not contain the If-Range request header field

417Mel-the server does not meet the expected value specified in the request Expect header field. If it is a proxy server, it may be that the server at the next level cannot meet the request.

500mura-an internal error occurred on the server

501Mel-the server does not support the requested function

502Mel-the server is temporarily unavailable, sometimes to prevent system overload

503mura-server overload or suspension of maintenance

504Mel-the gate is overloaded and the server uses another gate or service to respond to the user. The set value of waiting time is long.

505Mel-the server does not support or reject the HTTP version specified in the request header

After learning the status code, we can do some things:

1.var AJAX=new XMHttprequert ()

/ / dialing: set request parameters

2.AJAX.open ('get','data/test.json',true)

3. Ajax.onreadystatechange = function ()

{

If (ajax.readyState = = 4 & & ajax.status = = 200)

{

Func_succ (ajax.responseText)

}

Else

{

/ / alert ("ajax faild readyState:" + ajax.readyState+ "status:" + ajax.status)

}

}

4.ajax.send (null)

Compatibility and Encapsulation of AJAX

Function InitAjax () {

Var ajax=false

Try {

Ajax = new ActiveXObject ("Msxml2.XMLHTTP")

}

Catch (e) {

Try {

Ajax = new ActiveXObject ("Microsoft.XMLHTTP")

}

Catch (E) {

Ajax = false

}

}

If (! ajax & & typeof xMLHttpRequestrated undefined) {

Ajax = new XMLHttpRequest ()

}

Return ajax

}

Function DoAjaxGet (ajax, url, func_succ) {

Ajax.open ("GET", url, true)

Ajax.onreadystatechange = function () {

If (ajax.readyState = = 4 & & ajax.status = = 200) {

Func_succ (ajax.responseText)

} else {

/ / alert ("ajax faild readyState:" + ajax.readyState+ "status:" + ajax.status)

}

}

Ajax.send (null)

}

Function DoAjaxPost (ajax, url, func_succ, post_datas) {

Ajax.open ("POST", url, true)

Ajax.onreadystatechange = function () {

If (ajax.readyState = = 4 & & ajax.status = = 200) {

Func_succ (ajax.responseText)

} else {

Alert ('ajax faild readyState:'+ajax.readyState+ "status:" + ajax.status)

}

}

Ajax.setRequestHeader ("Content-Type", "application/x-www-form-urlencoded")

Ajax.send (post_datas)

}

Ajax cache problem: clear cache with timestamp

DoAjaxGet (ajax,'data/test.txt?t='+ new Date (). GetTime (), aaa)

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