js配列の並び替えと再帰的

 //    

var arr = [7, 4, 6, 8, 9, 13, 2, 3, 5, 4, 6];

   Array.prototype.unique = function () {
       var arr = [];
       for (var i = 0; i < this.length; i++) {
           if (arr.indexOf(this[i]) == -1) {
               arr.push(this[i]);
           }
       }
       return arr;
   }
   document.write("  ："+arr.unique() + "
");

var arr2 = [7, 4, 6, 8, 9, 13, 2, 3, 5];
 function sortArr(arr) {
     var temp = "";
     for (var i = 0; i < arr.length; i++) {
         for (var j = 0; j < arr.length - 1-i;j++)
         {
             if (arr[j] > arr[j + 1]) {
                 temp = arr[j+1];//4
                 arr[j + 1] = arr[j];//7
                 arr[j] = temp;//4
             }
         }
     }
     return arr;
 }
 document.write("  ："+sortArr(arr2)+"
");

 function f(n) {
     if (n==0)
     {
         return 0;
     }
     else if (n==1)
     {
         return 1;
     }
     else
     {
         return f(n-1)+f(n-2);
     }
 }
 document.write("  ："+f(5));