Provides an identifier for a statement.
label : statements
Labels are used by the break and continue statements to specify the statement to which the break and continue apply.
In the following statement the continue statement uses a labeled statement to create an array in which the third column of each row contains and undefined value:
function labelDemo(){
   var a = new Array();
   var i, j, s = "", s1 = "";
   Outer:
      for (i = 0; i < 5; i++)
      {
         Inner:
            for (j = 0; j < 5; j++)
            {  
               if (j == 2)
                  continue Inner;
               else
                  a[i,j] = j + 1;
            }
      }
      for (i = 0;i < 5; i++)
      {
         s = ""
         for (j = 0; j < 5; j++)
         {
            s += a[i,j];
         }
         s1 += s + "\n";
      }
      return(s1)
}