复制代码 代码如下:

function getHTTPRequest()

{

var xhr = false;

if (window.XMLHttpRequest)

xhr = new XMLHttpRequest(); //IE除外的浏览器

else if (window.ActiveXObject)

{

try

{

xhr = new ActiveXObject("Msxm12.XMLHTTP");//最新版的ActiveX对象

}

catch(e)

{

try

{

xhr = new ActiveXObject("Microsoft.XMLHTTP");

}

catch(e)

{

xhr = false;

}

}

}

}

接下来是一个应用的实例：

复制代码 代码如下:

//完整的GET请求

var request = getHTTPRequest();

if(request)

{

request.onreadystatechange = dosomething;

request.open("GET","file.doc",true);

request.send(null);

}