js通过XMLHttpRequest获取网页不能跨域，试iframe

var  myXmlHttpRequest;
function doGetmess(){
var tx=  document.getElementById('showText');
tx.innerHTML="你好啊";

checkNameAndPsw();

}

function getXmlhttpObject(){

if(window.XMLHttpRequest){
myXmlHttpRequest = new XMLHttpRequest();
}else if(window.ActiveXObject){
myXmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}
}

function checkNameAndPsw(){

getXmlhttpObject();
if(myXmlHttpRequest){
//var url="touch.lecai.com/page/award-result/list.html?v="+10+"&ver="+20150924.0.1;
var url="https://m.baidu.com";
myXmlHttpRequest.open("GET",url,true);
myXmlHttpRequest.onreadystatechange=callback;
myXmlHttpRequest.send(null);
}

}

function callback(){
alert(myXmlHttpRequest.readyState);
if(myXmlHttpRequest.readyState==4){
alert(myXmlHttpRequest.responseText);
//document.getElementById('showText').innerHTML=myXmlHttpRequest.responseText;
}
}