Ajax不执行回调函数问题
[code=JScript][/code]
function Check() {
var num = document.getElementById("txtNum").value;
httpRequest = ceartHttpRequest();
var url = "CouponsCheck.aspx?num=" + num;
httpRequest.open("POST", url, true);
//httpRequest.onreadystatechange == callback;
httpRequest.send(null);
httpRequest.onreadystatechange == function () {
if (httpRequest.readyState == 4 && httpRequest.status == 200) {
var response = request.responseText;
var Msg = document.getElementById("divMsg");
if (response == "0") {
Msg.innerHTML = "不存在！";
} else if (response == "1") {
Msg.innerHTML = "已使用！";
} else {
Msg.innerHTML = response;
}
} //
else
setTimeout("Check()", 1000);
}
}
用firebug调试果断的不执行回调函数。在firebug调试中，readystate=4, status=200 但是就是不进去。不知道为什么。大伙帮忙看看。

[解决办法]
httpRequest.onreadystatechange == function () {
httpRequest.onreadystatechange =function () {