AJAX的簡單應用,包括js彈出DIV層、層拖動、ajax后臺讀取數據！注意getinfo.asp文件是以utf-8格式保存的，在getinfo.asp里面可以寫讀數據庫代碼！

function createobj() { 
if (window.ActiveXObject) { 
return(new ActiveXObject("Microsoft.XMLHTTP")); 
} 
else if (window.XMLHttpRequest) { 
return(new XMLHttpRequest()); 
} 
} 


function personalInfo() { 
var oBao=createobj(); 
var cont=document.getElementById("person_detial"); 
var cont_a=document.getElementById("person_content"); 
cont.style.display='block'; 
cont.style.cursor='pointer'; 
cont_a.innerHTML="請等待,加載中..."; 
var my_url="getinfo.asp?"+Math.random(); 
oBao.open("get",my_url,true); 
oBao.onreadystatechange=function(){ 
if(oBao.readyState==4){ 
if(oBao.status==200){ 
cont_a.innerHTML=oBao.responseText; 
}else{ 
cont_a.innerHTML="出現錯誤,錯誤代碼為:"+oBao.status; 
} 
} 
} 
oBao.send(); 
} 



function Drag(id) 
{ 
var self=this; 
this.obj=(typeof(id)=="string")?document.getElementById(id):id; 
this.obj.onmousedown=function(e) 
{ 
e=e||window.event; 
var obj=self.obj;//指向自己 
if(e.layerX){obj.position={x:e.layerX,y:e.layerY};} 
else{obj.position={x:e.offsetX,y:e.offsetY};} 
document.onmousemove=self.start; 
document.onmouseup=self.end; 


} 
this.start=function(e) 
{ 
e=e||event; 
document.onselectstart = function(){ return false; }; 
window.getSelection && window.getSelection().removeAllRanges(); 
var obj=self.obj; 
obj.style.left=e.clientX-obj.position.x+"px"; 
obj.style.top=e.clientY-obj.position.y+"px"; 
} 
this.end=function(e) 
{ 
e=e||event; 
document.onmousemove = document.onmouseup = document.onselectstart = null; 
} 
}