Native Ajax submission PHP background receive no problem

varxmlHttp; if(window. ActiveXObject) {xmlHttp=NewActiveXObject ("Microsoft.XMLHTTP"); } Else if(window. XMLHttpRequest) {xmlHttp=NewXMLHttpRequest (); }functionGetappcaptcha (CDATA) {if(Iscaptcha) {return} Iscaptcha=true; Xmlhttp.open ("POST", aaa.php ');        Xmlhttp.setrequestheader ("Content-type", "application/x-www-form-urlencoded");        Xmlhttp.setrequestheader ("X-requested-with", "XMLHttpRequest");         Xmlhttp.send (Disposedata (CDATA));  Xmlhttp.onreadystatechange = function (data) {if (xmlhttp.readystate = = 4) && (Xmlhttp.status = = 200))                 {var sdata = Json.parse (data.currentTarget.response);                if (Sdata.error_code = = 0) {//Verify success//dry point what Isclick = false;                    }else if (Sdata.error_code = = 1048) {//More than four times Isclick = true; Document.queryselector ('. Pop_click_box '). style.display = ' block '}else{//Authentication failed Tipfun (SDATA.ERROR_MSG);            }} else {Isclick = false; }        }     }

The above code because PHP does the Ajax checksum needs

Xmlhttp.setrequestheader ("Content-type", "application/x-www-form-urlencoded");        Xmlhttp.setrequestheader ("X-requested-with", "XMLHttpRequest");
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PHP determines the principle of Ajax requests:

When sending an AJAX request, we can create a custom header message by XMLHttpRequest This object, in the jquery framework, for the $.ajax, $.get, or $.post methods that request the content of the Web page. It will pass a http_x_requested_with parameter to the server, PHP is in the header layer to determine whether the AJAX request, corresponding to $_server[' Http_x_requested_with '] judgment.

Attention:

• In general $_server[' Http_x_requested_with ') is XMLHttpRequest by default
• $_server[' Http_x_requested_with ' can also be custom created, using Xmlhttprequest.setrequestheader (Name,value);

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The submitted data requires the Disposedata method to be processed into the corresponding string to

//Pass-the- parameter encapsulation    functionDisposedata (data) {varstrdata = ", num = 0;  for(varKeyinchdata) {            if(num = = 0) {strdata= key + ' = ' +Data[key]; }Else{strdata+ = ' & ' + key + ' = ' +Data[key]; } num++; }        returnstrdata; }

A string like this gives the backstage name= place &bankcard=2321323123123&phone=13800138000

Native Ajax submission PHP background receive no problem