我試圖從3范圍滑塊計算價格，但是它返回了錯誤的結果，到目前為止我嘗試過：let result1 = 0;let result2 = 0;let result3 = 0;$('input[name="cdnvideolive"]').change(function() {  let val = parseInt($(this).val());  let price = 1000;  let result1 = price * val;  $('var').text(result1 + result2 + result3);});$('input[name="cdnvideovid"]').change(function() {  let val = parseInt($(this).val());  let price = 2000;  let result2 = price * val;  $('var').text(result1 + result2 + result3);});$('input[name="cdnvideostor"]').change(function() {  let val = parseInt($(this).val());  let price = 3000;  let result3 = price * val;  $('var').text(result1 + result2 + result3);});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script><input type="range" name="cdnvideolive" value="1" min="1" max="50" data-steps="50"><input type="range" name="cdnvideovid" value="1" min="1" max="20" data-steps="20"><input type="range" name="cdnvideostor" value="1" min="1" max="30" data-steps="30">total price: <var></var>$我想要所有范圍的總數，但它返回單個總計。我做錯了什么？