创建ajax对象并兼容多个浏览器

复制代码 代码如下:

<script>

function createAjax(){

var request=false;

//window对象中有XMLHttpRequest存在就是非IE,包括(IE7以上版本)

if(window.XMLHttpRequest){

request=new XMLHttpRequest();

if(request.overrideMimeType){

request.overrideMimeType(“text/xml”);

}

//window对象中有ActiveXObject属性存在就是IE

}else if(window.ActiveXObject){

var versions=[‘Microsoft.XMLHTTP’, ‘MSXML.XMLHTTP’, ‘Msxml2.XMLHTTP.7.0′,’Msxml2.XMLHTTP.6.0′,’Msxml2.XMLHTTP.5.0’, ‘Msxml2.XMLHTTP.4.0’, ‘MSXML2.XMLHTTP.3.0’, ‘MSXML2.XMLHTTP’];

for(var i=0; i<versions.length; i++){

try{

request=new ActiveXObject(versions[i]);

if(request){

return request;

}

}catch(e){

request=false;

}

}

}

return request;

}

var ajax=createAjax();

alert(ajax);

</script>

张贴在3