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Ajax的js封装

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);
                    }
  


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