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как мне вывести количество выбранных пользователем дат, чтобы посчитать скидку


biper
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В форме публикации объявления в газете указываются даты публикации в виде (день/месяц/год)

let dt = document.getElementById('dt');

        function setDate(d){

         dt.value += (dt.value == '') ? d : ', '+d;

        }

       

        function init() {

            if (arguments.callee.done) return;

            arguments.callee.done = true;

            changePrice();

         }

 

А как мне вывести количество выбранных пользователем дат, чтобы посчитать скидку при публикации в > 3 номерах ?

 

skid = Math.ceil(one_ad_cost * (dt > 3 ? dt : 0) * 0.07);

 

 

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