用ajax来请求页面，可以是其他站点的么？
假设我的web服务器是 www.aaa.com
我服务器的某个页面有ajax写的动态取其他网站页面数据的代码，
function showlog(szLog){ szLog = "[" + Date() + "]:" +szLog + "\n"; txt.value = szLog + txt.value; }function getObjXMLReq(){ var objXMLReq; //for Mozilla and Safari etc. if (window.XMLHttpRequest){ objXMLReq = new XMLHttpRequest(); } // IE5 for the mac claims to support window.ActiveXObject, but throws an error when it's used else if (window.ActiveXObject && !(navigator.userAgent.indexOf('Mac') >= 0 && navigator.userAgent.indexOf("MSIE") >= 0)){ objXMLReq = new ActiveXObject("Microsoft.XMLHTTP"); } return objXMLReq;}function adReq() { var objXMLReq = getObjXMLReq(); showlog("getObjXMLReq"); if(!objXMLReq){ return; } var url = "http://www.bbb.com/index"; objXMLReq.open("GET", url, false); objXMLReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); ret = objXMLReq.responseText; showlog(ret);}