校验ip地址

/^(([1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])\.){3}([1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])$/

替换ip、端口

url = url.replace(/^https:\/\/[^/]+\//, "https://127.0.0.1:8000/");  
url = url.replace(/^http:\/\/[^/]+\//, "http://127.0.0.1:8000/");