var xhr = createXHR(); function createXHR() { try { xhr = new ActiveXObject("Msxml2.XMLHTTP");//IE高版本创建XMLHTTP } catch(E) { try { xhr = new ActiveXObject("Microsoft.XMLHTTP");//IE低版本创建XMLHTTP } catch(E) { xhr = new XMLHttpRequest();//兼容非IE浏览器,直接创建XMLHTTP对象 } } return xhr; } xhr.open("get","test.txt",false); //xhr.setRequestHeader("MyHeader","MyValue"); xhr.send("dingss"); if((xhr.status >=200 && xhr.status<300|| xhr.status == 304)){ console.log(xhr.responseText); }else{ console.log("Request was unsuccessful: "+xhr.status); } //alert(typeof(xhr));