digikala.js

// ==UserScript==
// @encoding UTF-8
// @name Digikala
// @description Replaces
// @namespace http://novid.ir
// @include http://www.digikala.com/*
// @include http://digikala.com/*
// @version 1
// ==/UserScript==
    function newPrice() {
        var newPrice = [];
        var price = document.getElementsByClassName('newprice');
        for (var i = 0; i < price.length; ++i) {
            newPrice.push(parseFloat(price[i].innerHTML.replace(/[^\d\.]+/, '')));
        }
        return newPrice;
    }

    function oldPrice() {
        var oldPrice = [];
        var price = document.getElementsByClassName('oldprice');
        for (var i = 0; i < price.length; ++i) {
            oldPrice.push(parseFloat(price[i].innerHTML.replace(/[^\d\.]+/, '')));
        }
        return oldPrice;
    }


    function toPercent(oldPrice, newPrice) {
        var oldPrice = typeof oldPrice !== 'undefined' ? oldPrice : 0;
        if (oldPrice === 0) {
            return 0;
        } else {
            var percent = ((newPrice * 100) / oldPrice);
            return (100 - percent);
        }
    }

    function totalPercent() {
        var tPercent = [];
        var nPrice = newPrice();
        var oPrice = oldPrice();
        for (var i = 0; i < nPrice.length; ++i) {
            tPercent.push(toPercent(oPrice[i], nPrice[i]));
        }
        return tPercent;
    }

    function appendPercent() {
        var aPercent = [];
        var aPercent = totalPercent();
        $(".newprice").append("<p class=\"appendprice\">درصد تخفیف</p>");
        $('.appendprice').each(function(i) {
            $(this).attr('id', 'appendprice' + (i));
            $('#appendprice' + (i)).html(parseInt(aPercent[i]) + " درصد تخفیف");
        });
    }
appendPercent();