[JavaScript] 讀取Dom 並作排序

gistfile1.js

/*
  目的: 對購物網站項目的價格做排序 (購物網站網址：http://activity.books.com.tw/ps/prog/2601/page/200/category/217234)
  方法： 讀取Dom, 並sort()
*/
var all = $('li'); //先取全部的li
var chose = [];
var price = [];
var title =[]
var bookstore = [];
for(var key in all){   
   if(/li/.test(all[key].id)){   //檢查li id是否有值
     chose.push(all[key]);
   }
}
for(var index =0 ; index<chose.length; index++){
        price[index] = parseInt(chose[index].getElementsByTagName('strong')[0].innerText); //個別價格
        title[index] = chose[index].getElementsByTagName('h5')[0].innerText;               //個別名稱
        bookstore.push({title: title[index], price:price[index]});                                        
}
var sortbookstore = bookstore.sort(function(a,b){return a['price']-b['price']});
console.log(sortbookstore);           //排序過的