function checkip(ip) { var pcount = 0 var ip_length = ip.length var ip_letters = "1234567890." for (p=0; p < ip_length; p++) { var ip_char = ip.charAt(p) if (ip_letters.indexOf(ip_char) == -1) { return false } } for (var u = 0; u < ip_length; u++) { (ip.substr(u,1) == ".") ? pcount++ : pcount } if(pcount != 3) { return false } firstp = ip.indexOf(".") lastp = ip.lastIndexOf(".") str1 = ip.substring(0,firstp) ipstr_tmp = ip.substring(0,lastp) secondp = ipstr_tmp.lastIndexOf(".") str2 = ipstr_tmp.substring(firstp+1,secondp) str3 = ipstr_tmp.substring(secondp+1,lastp) str4 = ip.substring(lastp+1,ip_length) if (str1 == '' || str2 == '' || str3 == '' || str4 == '') { return false } if (str1.length > 3 || str2.length > 3 || str3.length > 3 || str4.length > 3) { return false } if (str1 <= 0 || str1 > 255) { return false } else if (str2 < 0 || str2 > 255) { return false } else if (str3 < 0 || str3 > 255) { return false } else if (str4 < 0 || str4 > 255) { return false } return true }
只需传入相应IP值即可。