使用JQuery进行跨域请求

代码如下：

$(document).ready(function(){ 
var container = $('#target'); 
container.attr('tabIndex','-1'); 
$('.ajaxtrigger').click(function(){ 
var trigger = $(this); 
var url = trigger.attr('href'); 
if(!trigger.hasClass('loaded')){ 
trigger.append('<span></span>'); 
trigger.addClass('loaded'); 
var msg = trigger.find('span::last'); 
} else { 
var msg = trigger.find('span::last'); 
} 
doAjax(url,msg,container); 
return false; 
}); 

function doAjax(url,msg,container){ 
// if the URL starts with http 
if(url.match('^http')){ 
// assemble the YQL call 
msg.removeClass('error'); 
msg.html(' (loading...)'); 
$.getJSON("http://query.yahooapis.com/v1/public/yql?"+ 
"q=select%20*%20from%20html%20where%20url%3D%22"+ 
encodeURIComponent(url)+ 
"%22&format=xml'&callback=?", 
function(data){ 
if(data.results[0]){ 
var data = filterData(data.results[0]); 
msg.html(' (ready.)'); 
container. 
html(data). 
focus(). 
effect("highlight",{},1000); 
} else { 
msg.html(' (error!)'); 
msg.addClass('error'); 
var errormsg = '<p>Error: could not load the page.</p>'; 
container. 
html(errormsg). 
focus(). 
effect('highlight',{color:'#c00'},1000); 
} 
} 
); 
} else { 
$.ajax({ 
url: url, 
timeout:5000, 
success: function(data){ 
msg.html(' (ready.)'); 
container. 
html(data). 
focus(). 
effect("highlight",{},1000); 
}, 
error: function(req,error){ 
msg.html(' (error!)'); 
msg.addClass('error'); 
if(error === 'error'){error = req.statusText;} 
var errormsg = 'There was a communication error: '+error; 
container. 
html(errormsg). 
focus(). 
effect('highlight',{color:'#c00'},1000); 
}, 
beforeSend: function(data){ 
msg.removeClass('error'); 
msg.html(' (loading...)'); 
} 
}); 
} 
} 
function filterData(data){ 
// filter all the nasties out 
// no body tags 
data = data.replace(/<?\/body[^>]*>/g,''); 
// no linebreaks 
data = data.replace(/[\r|\n]+/g,''); 
// no comments 
data = data.replace(/<--[\S\s]*?-->/g,''); 
// no noscript blocks 
data = data.replace(/<noscript[^>]*>[\S\s]*?<\/noscript>/g,''); 
// no script blocks 
data = data.replace(/<script[^>]*>[\S\s]*?<\/script>/g,''); 
// no self closing scripts 
data = data.replace(/<script.*\/>/,''); 
// [... add as needed ...] 
return data; 
} 
});