Array.prototype.mapA = function(fun /*, thisp*/)

  {

   var len = this.length;

   if (typeof fun != "function")

    throw new TypeError();

   var res = new Array(len);

   var thisp = arguments[1];

   for (var i = 0; i < len; i++)

   {

    if (i in this)

     res[i] = fun.call(thisp, this[i], i, this);

   }

   return res;

  };

   var ss = [1,2,3,4];

   var b = ss.mapA(function(item){

     return item+3;

   });

  //console.log(b);

 function BubbleSort(array,cb) {

   var length = array.length;

   for (var i = length - 1; i > 0; i--) { //用于缩小范围

     for (var j = 0; j < i; j++) { //在范围内进行冒泡，在此范围内最大的一个将冒到最后面

       if(cb.call(array,array[j],array[j+1])>0){

         var temp = array[j];

         array[j] = array[j+1];

         array[j+1] = temp;

       }

     }

   }

   return array;

 }

 Array.prototype.sortA = function(fun /*, thisp*/){

     var len = this.length;

     if (typeof fun != "function")

      throw new TypeError();

     var res = new Array(len);

     res = BubbleSort(this,fun);

     return res;

  };

  var sss = [32,23,5,95,4];

  var bb= sss.sortA(function(a,b){return a-b});

 console.log(bb);