收集的网上用的ajax之chat.js文件

答案：var xmlHttp = false; 
var ichatstate ; 
try { 
  xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); 
} catch (e) { 
  try { 
    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); 
  } catch (e2) { 
    xmlHttp = false; 
  } 
} 
if (!xmlHttp && typeof XMLHttpRequest != 'undefined') { 
  xmlHttp = new XMLHttpRequest(); 
} 


function sendmsg(){ 
            var msgbody = escape(document.getElementById("msgbody").value); 
            var sendto = escape(document.getElementById("sendto").value); 
            var SendData = "msgbody=" + msgbody +"&sendto=" + sendto; 
            xmlHttp.open("POST","../ichat/sendmsg.asp",false); 
            xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
            xmlHttp.onreadystatechange = function sendok(){ if (xmlHttp.readyState == 4) { } } 
            xmlHttp.send(SendData); 
            document.getElementById("msgbody").value = "";     
            showmsg(); 
} 


function hot_key() { 

if (window.event.keyCode==13 && window.event.ctrlKey && document.getElementById("msgbody").value != ""){sendmsg();} 

} 



function exitchat(){ 
  var url = "../ichat/online.asp?action=exit&pid=" +Math.random(); 
  xmlHttp.open("GET", url, true); 
  xmlHttp.send(null); 
} 

function intochat(){ 
window.ionline.location.href=>showmsg(); 
} 

function showonline(){ 
  var url = "../ichat/online.asp?action=showonline&pid=" +Math.random(); 
  xmlHttp.open("GET", url, true); 
  xmlHttp.send(null); 
} 

function showmsg(){ 
  var url = "../ichat/getmsg.asp?pid=" +Math.random(); 
  xmlHttp.open("GET", url, true); 
  xmlHttp.onreadystatechange = reloadX; 
  xmlHttp.send(null); 
} 

function reloadX() { 
if (xmlHttp.readyState == 4) { 
var response = xmlHttp.responseText; 
document.getElementById("mymsg").innerHTML = response; 
document.getElementById("mymsg").scrollTop=document.getElementById("mymsg").scrollHeight; 
setTimeout("showmsg();",10000); 
} 
} 


function saveset(){ 
            var mycolor = document.getElementById("mycolor").value; 
            var msgtotal = document.getElementById("msgtotal").value; 
            var mystate = document.getElementById("mystate").value; 
            var allowmsg = document.getElementById("allowmsg").value; 
            var closemsg; 

if(document.getElementById("closemsg").checked){ 
closemsg = document.getElementById("closemsg").value; 
}else{ 
closemsg = "off"; 
} 
            var SendData = "mycolor=" + mycolor + "&msgtotal=" + msgtotal + "&mystate=" + mystate + "&allowmsg=" + allowmsg + "&closemsg=" + closemsg; 
            xmlHttp.open("POST","../ichat/chatset.asp",false); 
            xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
            xmlHttp.onreadystatechange = function sendok(){ if (xmlHttp.readyState == 4) {  
alert('设定已经保存') 
if(ichatstate=="open"){window.location.reload();} 
} } 
            xmlHttp.send(SendData); 

            showmsg(); 
            document.getElementById('layer_ichatset').style.display='none'; 

    
} 

function openichat(){ 
ichatstate="open" 
} 

function closeichat(){ 
ichatstate="close" 
} 

function showonlineuser(){ 
document.getElementById('layer_online').style.display='block'; 

  var url = "../ichat/showonline.asp?pid=" +Math.random(); 
  xmlHttp.open("GET", url, true); 
  xmlHttp.onreadystatechange = reloadX2; 
  xmlHttp.send(null); 

} 

function reloadX2() { 
if (xmlHttp.readyState == 4) { 
var response = xmlHttp.responseText; 
document.getElementById("onlineuser").innerHTML = response; 
} 
} 

function readset(){ 
  document.getElementById('layer_ichatset').style.display='block'; 

  var url = "../ichat/myset.asp?pid=" +Math.random(); 
  xmlHttp.open("GET", url, true); 
  xmlHttp.onreadystatechange = showset; 
  xmlHttp.send(null); 

} 

function showset() { 
if (xmlHttp.readyState == 4) { 
var response = xmlHttp.responseText; 
document.getElementById("setplan").innerHTML = response; 
} 
} 

function setsendto(username) { 
if (username=="所有人"){ 
document.getElementById("sendto").value = ''; 
document.getElementById("talkwith").innerHTML = '所有成员'; 
}else{ 
document.getElementById("sendto").value = username; 
document.getElementById("talkwith").innerHTML = username; 
} 
  var url = "../ichat/checkuser.asp?user="+ escape(username) + "&pid=" +Math.random(); 
  xmlHttp.open("GET", url, true); 
  xmlHttp.onreadystatechange = showtips; 
  xmlHttp.send(null); 
} 

function showtips() { 
if (xmlHttp.readyState == 4) { 
var response = xmlHttp.responseText; 
document.getElementById("userstate").innerHTML = response; 
} 
} 

function clearlog() { 

if (window.confirm("您确定需要清除所有聊天记录吗?")==true) 
{ 
var url = "../ichat/clearlog.asp?pid=" +Math.random(); 
xmlHttp.open("GET", url, true); 
xmlHttp.send(null); 
} 

} 


var ichatwinstate 
ichatwinstate="max"; 

function min() 
{ 
ichatwinstate = (ichatwinstate=="max")?"min":"max" 

if (ichatwinstate=="min"){ 
document.getElementById('mbody').style.display='none'; 
document.getElementById('myichat').height= parseInt(document.getElementById('ichat_title').height); 
document.getElementById('myichat').style.top = document.body.clientHeight - parseInt(document.getElementById("ichat_title").style.height) + document.body.scrollTop; 
}else{ 
document.getElementById('mbody').style.display='block'; 
iresize(); 
} 
} 


function closeit(){ 
document.getElementById('myichat').style.display='none'; 
} 


function iresize(){ 
if (ichatwinstate=="min"){ 
document.getElementById('myichat').style.top = document.body.clientHeight - parseInt(document.getElementById("ichat_title").style.height) + document.body.scrollTop - 1; 
}else{ 
document.getElementById('myichat').style.top = document.body.clientHeight  + document.body.scrollTop - parseInt(document.getElementById("mbody").style.height) -85; 
} 
} 



var ey=0,ex=0,lx=0,ly=0,canDrg=false,thiso=null; 
var x, y,rw,rh; 

function dargit(o,e) //主函数 
{ 
    thiso = o; 
    canDrg = true; 
    if(!document.all) 
    { 
        lx = e.clientX; ly = e.clientY; 
    } 
    else 
    { 
        lx = event.x; ly = event.y; 
    } 
    if(document.all) thiso.setCapture(); 
    try{} 
    catch(e){}      
    st(o);//置前或置后 

} 
document.onmousemove=function(e) 
{ 
    if(!document.all){ x = e.clientX; y = e.clientY; }else{ x = event.x; y = event.y; } 
        if(canDrg) 
        { 
            var ofsx = x - lx; 
            thiso.style.left = parseInt(thiso.style.left) + ofsx; 
            lx = x; 
            var ofsy = y - ly; 
            thiso.style.top = parseInt(thiso.style.top) + ofsy; 
            ly = y; 

            // 状态栏显示数据 
            //window.status=thiso.style.left+"left:top"+thiso.style.top+" rh:rw"+rh+"+"+rw; 
        } 
} 

document.onmouseup=function() 
{ 
    canDrg=false;//拖拽变量设为false 
    try{} 
    catch(e){} 
    if(document.all && thiso != null) 
    { 
        //ie下，将清捕获; 
        thiso.releaseCapture(); 
        thiso = null; 
    } 
} 


function st(o) 
{ 

    var p = o.parentNode; 
    if(p.lastChild != o) 
    { 
      p.appendChild(o); 
    } 
    if(rh<=20 && rw>=160) 
    { 
        canDrg=false; <

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