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function query(){
if (xmlHttp.readyState == 4 ){
if (xmlHttp.status==200)
{
if (xmlHttp.responseText=="true"){
document.getElementById("checkusername").innerText="¸ÃÕʺÅÒѱ»Õ¼ÓÃ";
//document.getElementById("checkusername").innerText=xmlHttp.responseText;
document.all.isadd.value="true";
}else {
document.getElementById("checkusername").innerText="¸ÃÕʺſÉÓÃ";
document.all.isadd.value="false";
}
}
}
}
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<input type="text" name="username" class="inputtext" size="25" onkeyup="usernamecheck()">

JScript code:

var xmlHttp;
function createAJAX(){
try{
xmlHttp = new XMLHttpRequest();
} catch(e){
try{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP")
} catch(e){
try{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
} catch(e){
alert("ÄúµÄä¯ÀÀÆ÷²»Ö§³ÖAJAX£¡");
return;
}
}
}
}
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