Java,Javascript,Oracle开发生成UUID或GUID方法总结

/* 参数middle_line true:带中划线 false不带中划线*/
function newGuid(middle_line)
     {
var length = 32;
         var result = "";
         for ( var i = 1; i <= length; i++)
         {
             var n = Math.floor(Math.random() * 16.0);
             if (n < 10)
             {
                 result += n;
             }
             else if (n == 10)
             {
                 result += "a";
             }
             else if (n == 11)
             {
                 result += "b";
             }
             else if (n == 12)
             {
                 result += "c";
             }
             else if (n == 13)
             {
                 result += "d";
             }
             else if (n == 14)
             {
                 result += "e";
             }
             else if (n == 15)
             {
                 result += "f";
             }
             if (middle_line && ((i == 8) || (i == 12) || (i == 16) || (i == 20)))
             {
                 result += "-";
             }
         }
         return result;
     };