function xss_ajax(url, callback) 
{
   var script_id = null;
   var script = document.createElement('script');
   script.setAttribute('type', 'text/javascript');
   script.setAttribute('src', url);
   script.setAttribute('id', 'coolshell_script_id');

    script.onload = script.onreadystatechange = function(){
        if((!this.readyState || this.readyState === "loaded" || this.readyState === "complete")){
            callback && callback();
        }
    };

   script_id = document.getElementById('coolshell_script_id');
   if(script_id){
       document.getElementsByTagName('head')[0].removeChild(script_id);
   }

   // Insert <script> into DOM
   document.getElementsByTagName('head')[0].appendChild(script);
}


function xss_rpc_call(n, callback)
{ 
    var callbackName="xss_rpc_callback";
    var url = "https://coolshell.cn/t.php?n="+n+"&callback="+callbackName;
    xss_ajax(url);
    xss_rpc_callback = function(result){
       var timeout =  Math.round(Math.random() * 1000)
       callback && setTimeout(function(){callback(result);}, timeout);
       //callback && callback(result) ;
    }
}

function xss_rpc_call2(n, callback)
{
    var callbackName="xss_rpc_callback"+ n + Math.round(Math.random() * 100000);
    var url = "https://coolshell.cn/t.php?n="+n+"&callback="+callbackName;
    xss_ajax(url);
    window[callbackName] = function(result){
       var timeout =  Math.round(Math.random() * 1000)
       callback && setTimeout(function(){callback(result);}, timeout);
       //callback && callback(result);
    }
}