Here's a simple implementation using JavaScript and HTML:，，``html，，，，Dropdown Search，，，，，Apple，Banana，Cherry，，，，， const searchInput = document.getElementById('searchInput');， const dropdownMenu = document.getElementById('dropdownMenu');，， searchInput.addEventListener('input', function() {， const searchValue = this.value.toUpperCase();， const options = dropdownMenu.options;， for (let i = 0; i< options.length; i++) {， if (options[i].text.toUpperCase().indexOf(searchValue) > 1) {， options[i].style.display = '';， } else {， options[i].style.display = 'none';， }， }， });，，，，``