es6

class Search {
  constructor() {
    this.searchToggle = document.getElementById('searchToggle');
    this.onSearchToggle();
  }

  onSearchToggle() {
    this.searchToggle.addEventListener('click', () => {
      console.log(123);
    });
  }
}

document.addEventListener('DOMContentLoaded', () => {
  new Search();
});

export default Search;