ajax-return value-when using AJAX, why use get can get the value in the background PHP page, and Post does not?

1. Get mode

    document.getElementById ("Save"). Onclick=function () {var request=new xmlhttprequest (); Request.open ("GET", "Http://localhost/service.php?username=" +document.getelementbyid ("Stuname"). Value+ "& Number= "+document.getelementbyid (" Stunumber "). value+" &sex= "+document.getelementbyid (" Stusex "). Value+" &            job= "+document.getelementbyid (" Stujob "). Value);                           Request.send (NULL); Request.onreadystatechange=function () {if (request.readystate===4) {if (request.st                        atus===200) {document.getElementById ("Saveresult"). Innerhtml=request.responsetext;                        }else{alert ("An error occurred in LA:" +request.status);   }}}}service.php $username =$_get[' username '];    $password =$_get["number"];    $sex =$_get["Sex"];      $job =$_get["Job"]; if ($username = = "One") && ($password) && ($sex) &Amp;& ($job)) {echo ' {"Success": "True", "MSG": "Student added Success"};   }else{Echo ' {"Success": "false", "MSG": "Parameter error, fill in the information is not full"}; The result: is correct.        However, for post delivery, there is a problem with the code as follows: document.getElementById ("Save"). Onclick=function () {var request=new xmlhttprequest (); var data= "name1=" +document.getelementbyid ("Stuname"). value+ "&number=" +document.getelementbyid ("Stunumber").   Value+ "&sex=" +document.getelementbyid ("Stusex"). value+ "&job=" +document.getelementbyid ("Stujob"). Value;        Request.open ("POST", "http://localhost/service.php");    Request.setrequestheader ("Content-type", "appliaction/x-www-form-urlencoded");        Request.send (data); Request.onreadystatechange=function () {if (request.readystate===4) {if (request.status===2                        XX) {document.getElementById ("Saveresult"). Innerhtml=request.responsetext;                        } else{alert ("An error occurred in LA:" +request.status);}}}} service.php code: Var_dump ($_server[' request_method ');//For testing $use   rname=$_post[' name1 '];    $password =$_post["number"];    $sex =$_post["Sex"];      $job =$_post["Job"]; if ($username = = "One") && ($password) && ($sex) && ($job)) {echo ' {"Success": "True", "MSG": "Student added to      "}";    } else{Echo ' {"Success": "false", "MSG": "Parameter error, fill in the information is not full"};     }

The result is:

String (4) "POST"
notice:undefined index:name1 in d:phpstudywwwservice.php on line 23
notice:undefined Index:number in d:phpstudywwwservice.php on line 24
notice:undefined Index:sex in d:phpstudywwwservice.php on line 25
notice:undefined index:job in d:phpstudywwwservice.php on line 26
{"Success": "false", "MSG": "Parameter error, fill in information not complete"}
, what is this for? Where did I write the question? Please expert guidance, thank you!

Reply content:

1. Get mode

    document.getElementById ("Save"). Onclick=function () {var request=new xmlhttprequest (); Request.open ("GET", "Http://localhost/service.php?username=" +document.getelementbyid ("Stuname"). Value+ "& Number= "+document.getelementbyid (" Stunumber "). value+" &sex= "+document.getelementbyid (" Stusex "). Value+" &            job= "+document.getelementbyid (" Stujob "). Value);                           Request.send (NULL); Request.onreadystatechange=function () {if (request.readystate===4) {if (request.st                        atus===200) {document.getElementById ("Saveresult"). Innerhtml=request.responsetext;                        }else{alert ("An error occurred in LA:" +request.status);   }}}}service.php $username =$_get[' username '];    $password =$_get["number"];    $sex =$_get["Sex"];      $job =$_get["Job"]; if ($username = = "One") && ($password) && ($sex) &Amp;& ($job)) {echo ' {"Success": "True", "MSG": "Student added Success"};   }else{Echo ' {"Success": "false", "MSG": "Parameter error, fill in the information is not full"}; The result: is correct.        However, for post delivery, there is a problem with the code as follows: document.getElementById ("Save"). Onclick=function () {var request=new xmlhttprequest (); var data= "name1=" +document.getelementbyid ("Stuname"). value+ "&number=" +document.getelementbyid ("Stunumber").   Value+ "&sex=" +document.getelementbyid ("Stusex"). value+ "&job=" +document.getelementbyid ("Stujob"). Value;        Request.open ("POST", "http://localhost/service.php");    Request.setrequestheader ("Content-type", "appliaction/x-www-form-urlencoded");        Request.send (data); Request.onreadystatechange=function () {if (request.readystate===4) {if (request.status===2                        XX) {document.getElementById ("Saveresult"). Innerhtml=request.responsetext;                        } else{alert ("An error occurred in LA:" +request.status);}}}} service.php code: Var_dump ($_server[' request_method ');//For testing $use   rname=$_post[' name1 '];    $password =$_post["number"];    $sex =$_post["Sex"];      $job =$_post["Job"]; if ($username = = "One") && ($password) && ($sex) && ($job)) {echo ' {"Success": "True", "MSG": "Student added to      "}";    } else{Echo ' {"Success": "false", "MSG": "Parameter error, fill in the information is not full"};     }

The result is:

String (4) "POST"
notice:undefined index:name1 in d:phpstudywwwservice.php on line 23
notice:undefined Index:number in d:phpstudywwwservice.php on line 24
notice:undefined Index:sex in d:phpstudywwwservice.php on line 25
notice:undefined index:job in d:phpstudywwwservice.php on line 26
{"Success": "false", "MSG": "Parameter error, fill in information not complete"}
, what is this for? Where did I write the question? Please expert guidance, thank you!

Post with $_post fetch
If you want to take the get again, you can use $_request.

Because you're using $_get in PHP, you can only get the values that get passed in.

$_get getting parameters in a URL connection
$_post get the parameters of the POST submission
$_request can get parameters to get and post

In your case, using $_get is not getting the post parameters.

The parameter format is incorrect when the post request is changed to var postdata = {"name1": "Value1", "name2": "value2"} so try it. You can debug it F12.

