function ipToNumber(ip) {   var num = 0;   if(ip == "") {     return num;   }     var aNum = ip.split(".");    if(aNum.length != 4) {     return num;   }     num += parseInt(aNum[0]) << 24;   num += parseInt(aNum[1]) << 16;   num += parseInt(aNum[2]) << 8;   num += parseInt(aNum[3]) << 0;   num = num >>> 0;//這個很關(guān)鍵，不然可能會出現(xiàn)負(fù)數(shù)的情況   return num;  }     function numberToIp(number) {     var ip = "";   if(number <= 0) {     return ip;   }   var ip3 = (number << 0 ) >>> 24;   var ip2 = (number << 8 ) >>> 24;   var ip1 = (number << 16) >>> 24;   var ip0 = (number << 24) >>> 24      ip += ip3 + "." + ip2 + "." + ip1 + "." + ip0;      return ip;   } 

//IP轉(zhuǎn)成整型function _ip2int(ip) {  var num = 0;  ip = ip.split(".");  num = Number(ip[0]) * 256 * 256 * 256 + Number(ip[1]) * 256 * 256 + Number(ip[2]) * 256 + Number(ip[3]);  num = num >>> 0;  return num;}//整型解析為IP地址function _int2iP(num) {  var str;  var tt = new Array();  tt[0] = (num >>> 24) >>> 0;  tt[1] = ((num << 8) >>> 24) >>> 0;  tt[2] = (num << 16) >>> 24;  tt[3] = (num << 24) >>> 24;  str = String(tt[0]) + "." + String(tt[1]) + "." + String(tt[2]) + "." + String(tt[3]);  return str;}