问通过标签输入的值递增数组元素

EN

add.addEventListener('click', function() {
          
          let basket = JSON.parse(localStorage.getItem('basket'));   // Parse data from localstorage
          
          let elementimageUrl = element.imageUrl;                     // element.imageUrl is a part of backend data received from JSON file
          let elementId = element._id;                                // element._id is a part of backend data received from JSON file
          let elementName = element.name;                             // element.name is a part of backend data received from JSON file
          let elementPrice = element.price;                          // element.price is a part of backend data received from JSON file
          let add2 = document.getElementById("userinput").value;     // add2 varriable get value from label
          let yInt = Number.parseInt(add2);                         // parse label value to Integer number
          console.log(yInt);                                        // console log to check number
          let elementQuantity = yInt;                               // assign label value to elementQuantity
          console.log(elementQuantity);

          if (!basket) {
            basket = [];
          }
        
          // find the index of the item if already in basket
          const itemIndexInBasket = basket.findIndex(basketEntry => basketEntry.elementId === elementId);
          if (itemIndexInBasket !== -1) {
            basket[itemIndexInBasket].elementQuantity++;
          } else {
            basket.push({elementId, elementName, elementPrice, elementQuantity, elementimageUrl});    // Push not existing data to localstorage
          } 
          localStorage.setItem('basket', JSON.stringify(basket));
        })