原生ajax封装

/**

* Created by Computer on 2016/6/20.

*/

function createHTTPRequest(){

try{

return new window.XMLHttpRequest();

}catch (e){

try{

return new ActiveXObject("MSXML2.XMLHTTP.6.0");

}catch (e){

try{

return new ActiveXObject("MSXML2.XMLHTTP.3.0");

}catch (e){

try{

return new ActiveXObject("MSXML2.XMLHTTP");

}catch (e){

throw Error("this browser is not supported");

return;

}

}

}

}

}

function ajaxRequest(_method,_url,_async,_parameter,_function){

var _ajax=createHTTPRequest();

if(_ajax){

_ajax.onreadystatechange=function(){

if(_ajax.readyState==4 && _ajax.status==200){

_function(_ajax.responseText);

}

}

_ajax.open(_method,_url,_async);

_ajax.setRequestHeader("Content-Type","Application/x-www-form-urlencoded;charset=utf-8");

_ajax.send(_parameter);

}

}