Ajax compatibility related issues in Firefox browser, the program runs normally in IE

Ajax compatibility problem in Firefox browser, the program runs normally in IE
var Xmlhttp=false;
function Createxmlhttp () {
try{
Xmlhttp=new XMLHttpRequest ();
}catch (Trymicrosoft) {
try{
Xmlhttp=new ActiveXObject ("msxml2.xmlhttp");
}catch (Othermicrosoft) {
try{
Xmlhttp=new ActiveXObject ("Microsoft.XMLHTTP");
}catch (failed) {
Xmlhttp=false;
}
}
}
if (!xmlhttp) {
Alert ("Cannot create XMLHttpRequest Object! ");
}
}
function Ajaxcheck () {
var num=document.myform.uname.value;//getting the form's data
var url= "check.php?n=" +num;
Createxmlhttp ();
Xmlhttp.open ("GET", url,true);//The true representation here is an asynchronous request
Xmlhttp.onreadystatechange=updatepage;
Xmlhttp.send (NULL);
}

function Updatepage () {
if (xmlhttp.readystate==4) {
var Response=xmlhttp.responsetext;
if (response== "OK") {
Document.myform.nameerr.value= "√";
return true;
}else if (response== "no") {
document.myform.nameerr.value= "x user name is occupied";
return false;
}else{
Document.myform.nameerr.value= "Server is having problems";
return false;
}
}
}




Code as above, I am using AJAX to detect the existence of the user name, in Firefox, if the name of the English mother, can be normal, if the Chinese name will not be judged, how the matter ah????

------Solution--------------------
Should be in the Ajaxcheck send the request when the error, may be the problem caused by Chinese,
You can be in the check.php page echo user name, see if it is garbled, if it is garbled, use UrlEncode to deal with
------Solution--------------------
var url= "check.php?n=" +num;
Url=encodeuri (URL);
------Solution--------------------
In the check.php page echo user name, see if it is garbled, if it is garbled, use UrlEncode to deal with
------Solution--------------------
Explore
Reference: What is database encoding? What is the registration page script encoding? Are the two consistent? , inconsistent words have to use the Iconv () function to convert the data character encoding
My database, database, table, fields are used gb2312, in check.php also added mysql_query ("set character set gb2312");

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