var http_request=false;
  function send_request(method,url,date){//初始化，指定处理函数，发送请求的函数
    http_request=false;
        //开始初始化XMLHttpRequest对象
        if(window.XMLHttpRequest){//Mozilla浏览器
         http_request=new XMLHttpRequest();
         if(http_request.overrideMimeType){//设置MIME类别
           http_request.overrideMimeType("text/xml");
         }
        }
        else if(window.ActiveXObject){//IE浏览器
         try{
          http_request=new ActiveXObject("Msxml2.XMLHttp");
         }catch(e){
          try{
          http_request=new ActiveXobject("Microsoft.XMLHttp");
          }catch(e){}
         }
    }
        if(!http_request){//异常，创建对象实例失败
         window.alert("创建XMLHttp对象失败！");
         return false;
        }
        http_request.onreadystatechange=processrequest;
        //确定发送请求方式，URL，及是否同步执行下段代码
		if(method=="GET"){
    	http_request.open("GET",url,true);
        http_request.send(null);
		}else if(method=="POST"){
		http_request.open("POST",url,true);	
    	http_request.setRequestHeader("content-length",date.length);
    	http_request.setRequestHeader("content-type","application/x-www-form-urlencoded");
		http_request.send(date);
		}
  }