js的Array的map和sort实现方法

 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);