IP地址JS

Question

var CheckIP = function(){
            var a = document.getElementById("Bip").value;
            var b = document.getElementById("Eip").value; 
            a = a.Trim();
            b = b.Trim();
            if(a != "*")
            {
                if(isIP(a) == false)
                {
                    alert("IP地址不合法");
                    return false;
                }
            }
            if(b != "*")
            {
                if(isIP(b) == false)
                {
                    alert("IP地址不合法");
                    return false;
                }
            }
        }

Answer 1

var isIP = function(str){        var   ip   =   /^([0-9]|[0-9]\d|1\d{2}|2[0-1]\d|22[0-3])(\.(\d|[0-9]\d|1\d{2}|2[0-4]\d|25[0-5])){3}$/;   
        return  ip.test(str);   
        };