text: 'use strict';
  
  document.getElementById('donokon').addEventListener('click', () => {
    const url = new URL('https://twitter.com/intent/tweet');
    url.searchParams.set('url', location.href);
    url.searchParams.set('text', 'ドノカさんこんばんは！ #donokon');
    location.href = url;
  });
  