ajax基本格式

紫恋

function create_ajax()
{
if(window.ActiveXObject)//IE浏览器
{
   ajax_obj = new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest)//网景浏览器
{
   ajax_obj = new XMLHttpRequest();
   ajax_obj.overrideMimeType("text/xml");
}
}
function send(url)//发送
{
create_ajax();
ajax_obj.open("POST",url,false);//POST方式提交
ajax_obj.setRequestHeader("Content-Type","application/x-www-form-urlencoded");//发送头部文件
ajax_obj.onreadystatechange = getvalue;//设置接收函数
value = "id="+document.form1.classid.value;
ajax_obj.send(value);
}
function getvalue()
{
if(ajax_obj.readyState == 0)
{
   pro_div.innerHTML = "初始化";
}
if(ajax_obj.readyState == 1)
{
   pro_div.innerHTML = "加载中";
}
if(ajax_obj.readyState == 2)
{
   pro_div.innerHTML = "处理中";
}
if(ajax_obj.readyState == 4)
{
   text = ajax_obj.responseText;
   pro_div.innerHTML = text;
}
}