function send_request(callback, urladdress, isReturnData){
var xmlhttp = getXMLHttpRequest();
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState == 4) {//readystate 为4即数据传输结束
try{
if(xmlhttp.status == 200){
if(isReturnData && isReturnData==true){
callback(xmlhttp.responseText);
}
}else{
callback("抱歉，没找到此页面:"+ urladdress +"");
}
} catch(e){
callback("抱歉，发送请求失败，请重试 " + e);
}
ajax弹出提示信息
1、 输入域：
<h2>工具提示</h2>
<hr>
<a href="#" onmouseover="over(0)" onmouseout="out()">物品一</a><br><br>
<a href="#" onmouseover="over(1)" onmouseout="out()">物品二 ......
