//-----------------------------------存储结构为数组--------------------------------------------

 function Stack(){

     this.store = [];

     this.top = 0;

     this.push = push;

     this.pop = pop;

     this.display = display;

     this.length = length;

     this.binary_10 = binary_10;

 }

 function push(ele){

     this.store[this.top] = ele;

     this.top++;  //top指向下一个元素

 }

 function pop(){

     return this.store[--this.top];

 }

 function peek(){

     return this.store[this.top-1];

 }

 function length(){

     return this.top;

 }

 function display(){

     for(var i=this.length()-1; i>-1; i--){

         console.log(this.store[i]);

     }

 }

 function binary_10(){

     var sum = 0;

     var j = 0;

     for(var i=this.top-1; i>-1; i--){

         sum += this.store[i] * Math.pow(2,j);

         j++;

     }

     return sum;

 }

 var stack = new Stack();

 var num = '11001001';

 for(var i=0; i<num.length; i++){

     stack.push(num[i]);

 }

 stack.display();

 console.log(stack.binary_10());