回送地址(127.x.x.x)是本机回送地址(loopback address)
var ipnotstartwith127 = function(ip) { try { var data = ip.split("."), ip1; return 4 == data.length && 127 !== parseint(data[0]) } catch (e) { return !1 } } console.log(ipnotstartwith127("127.0.0.1")); // false console.log(ipnotstartwith127("192.168.1.1")); // true