php跳转不改变浏览器地址

function createXMLHttpRequest(){ if(window.XMLHttpRequest){ XMLHttpR = new XMLHttpRequest(); }else if(window.ActiveXObject){ try{ XMLHttpR = new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){ try{ XMLHttpR = new ActiveXObject("Microsoft.XMLHTTP"); }catch(e){ } } } } function sendRequest(url){ createXMLHttpRequest(); XMLHttpR.open("GET",url,true); XMLHttpR.setRequestHeader("Content-Type","text/html;charset=utf-8"); XMLHttpR.onreadystatechange = processResponse; XMLHttpR.send(null); } function processResponse(){ if(XMLHttpR.readyState ==4 && XMLHttpR.status == 200){ document.write(XMLHttpR.responseText); } }