Tanlash uchun variant qo'shing

<select> mavjud:

          <select id="genres">
  <option value="rock">Rock</option>
  <option value="blues" selected>Blues</option>
</select>
        

JavaScript-dan foydalaning:

Tanlangan variantning qiymati va matnini ko’rsating.
Variant qo‘shing: <option value="classic">Klassik</option>.
Uni tanlab qo’ying.

E’tibor bering, agar siz hamma narsani to’g’ri bajargan bo’lsangiz, ogohlantirishingizda ko'klar ko’rinishi kerak.

Bosqichma bosqich yechim:

<select id="genres">
  <option value="rock">Rock</option>
  <option value="blues" selected>Blues</option>
</select>

<script>
  // 1)
  let selectedOption = genres.options[genres.selectedIndex];
  alert(selectedOption.value);

  // 2)
  let newOption = new Option("Classic", "classic");
  genres.append(newOption);

  // 3)
  newOption.selected = true;
</script>