我正在使用以下代码使用 YQL 执行跨域 AJAX 请求:
function requestCrossDomain( site, callback ) {
function cbFunc(data) {
// If we have something to work with...
alert("inside call back");
if ( data.results[0] ) {
    // Strip out all script tags, for security reasons.
    // BE VERY CAREFUL. This helps, but we should do more. 
    data = data.results[0].replace(/<script[^>]*>[\s\S]*?<\/script>/gi, '');
    // If the user passed a callback, and it
    // is a function, call it, and send through the data var.
    if ( typeof callback === 'function') {
        callback(data);
    }
}
// Else, Maybe we requested a site that doesn't exist, and nothing returned.
else throw new Error('Nothing returned from getJSON.');
}   
// If no url was passed, exit.
if ( !site ) {
    alert('No site was passed.');
    return false;
}
// Take the provided url, and add it to a YQL query. Make sure you encode it!
var yql = 'http://query.yahooapis.com/v1/public/yql?q=' + encodeURIComponent('select * from html where url="' + site + '"') + '&format=xml&callback=cbFunc';
// Request that YSQL string, and run a callback function.
// Pass a defined function to prevent cache-busting.
$.getJSON( yql, cbFunc );
console.log("outside call back");
}
并按如下方式调用上述内容:
    requestCrossDomain('http://www.cnn.com', function(results) { 
       alert(results);
    });
当我在firefox中运行上述代码时,虽然响应(在firebug控制台中)显示回调函数(cbFunc)内的网站内容,但它没有显示任何警报。
第 5 行的结果console.log("inside call back")也没有在 firebug 控制台中打印。
谁能建议我哪里出了问题或对上面的任何解释? 
顺便说一句,我已经通过了: http: 
//tek-insight.blogspot.in/2010/05/cross-domain-ajax-request-proxy-json.html 
http://net.tutsplus.com/tutorials/javascript- ajax/quick-tip-cross-domain-ajax-request-with-yql-and-jquery/
相关 stackoverflow 问题中的可能解释。