原始ajax如何把异步获取到的数据返回？

假如异步获取数据的方法是:GetAjax();
我想直接在一方法中获取该数据然后对其进行操作。
如：
    function Example()
    {
        var obj=GetAjax();
        ..................
    }
<input type="Button" onclick="Example()">
请问大家知道吗？

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用WebService

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在你的回调函数里获取

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引用

<br /> ajax.js <br /> JScript codevar Ajax=function(){ <br /> <br /> }; <br /> <br /> Ajax.getHttpRequest=function(){if (window.XMLHttpRequest) {returnnew XMLHttpRequest(); <br /> &nbsp; &nbsp; }elseif(window.createRequest){return window.createRequest(); <br /> &nbsp; &nbsp; }var prefixes= [&quot;MSXML2&quot;,&quot;Microsoft&quot;,&quot;MSXML&quot;,&quot;MSXML3&quot;];for(var i=0;i &lt;prefixes.length;i++){try{returnnewnew ActiveXObject(prefixes[i]+&quot;.XmlHttp&quot;); }catch (ex){} <br /> &nbsp; &nbsp; }thrownew Error(&quot;Could not find an installed XML parser.&quot;); <br /> }; <br /> <br /> Ajax.get=function(url, callback){var req= Ajax.getHttpRequest(); <br /> &nbsp; &nbsp; req.open(&quot;GET&quot;, url,true); <br /> &nbsp; &nbsp; req.onreadystatechange=function(){if(req.readyState==4){ <br /> &am