XmlHttp请求状态0，localhost问题（javascript，ajax，php）帮助

I am using xampp to test my codes. I am using dreamweaver live view. In live view, and return a xmlhttp.status code of 200 and echo outputs. But when I try to view it in IE or FF, the status code is 0, and no output. I read that this seems to be a problem with the URL (absolute/relative??), I tried multiple URL formats, but can't seem to get it to work.I am using xampp to test my codes. I am using d