ajax应用

<DIV class=box id=top_bar>Web Tools--Ajax Version </DIV><BR>
<DIV class="box general">    天气预报： <INPUT id=Weather size=17
value=北京>   <INPUT onclick=getWeather() type=button value="提 交" name=submit>   <SPAN
id=Disp_Weather></SPAN></DIV>
<DIV class="box general">  IP地址查询： <INPUT id=Ip maxLength=17 size=17
value=127.0.0.1>   <INPUT onclick=getIp() type=button value="提 交" name=submit>   <SPAN
id=Disp_IPArea></SPAN></DIV>
<DIV class="box general">手机归属查询： <INPUT id=Mobile maxLength=15 size=17 value=13>
  <INPUT onclick=getMobile() type=button value="提 交">   <SPAN
id=Disp_MobileArea></SPAN></DIV>
<SCRIPT language=JavaScript type=text/javascript>
            chgBtnStyle();
        </SCRIPT>
//针对不同的浏览器获取指定的id对象
function getObj(objID) {
    return document.all ? document.all[objID] : document.getElementById(objID);
}
var req;
//使用xmlrequest对象
function createXHR() {
    try {
        req = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e) {
        try {
            req = new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch (E) {
            req = false;
        }
    }
    if (!req && typeof XMLHttpRequest != "undefined") {
        req = new XMLHttpRequest();
    }
}
function getWeather() {
    createXHR();
    req.open("GET", "weather.asp?City=" + getObj("Weather").value, true);
    req.send();
    req.onreadystatechange = handleStateChange1;
}
function handleStateChange1() {
    if (req.readyState<4){getObj("Disp_Weather").innerText = "正在查询["+getObj("Weather").value+"]天气状况..."}
    else if (req.readyState == 4 && req.status == 200) {
        getObj("Disp_Weather").innerText = req.responseText;
    } else {
        getObj("Disp_Weather").innerText = "u67e5u8be2u8fc7u7a0bu51fau73b0u8fc7u7a0buff0cu8bf7u91cdu8bd5u6216u8054u7cfbu7ba1u7406u5458uff01";
    }
}
function checkip() {
    var ipArray, ip, j;
    ip = getObj("Ip").value;