Chrome扩展中的JSONP请求，回调函数不存在？

I am making a JSONP request in a chrome extension (content script) . Everything works very well when I am running as a webpage -loading the HTML file in my browser-, but when I load it as a chrome extension, the jsonp callback function created by jquery doesn't seem to exist when the server gives its response.I am making a JSONP request in a chrome extensi