how to give your JavaScript button to keyboard shortcut code example

Example 1: js shortcut

document.addEventListener('keydown', (e) => {
  if (e.ctrlKey && String.fromCharCode(e.keyCode).toLowerCase() === 's') {
    e.preventDefault();
    e.stopPropagation();
    // Do some stuff...
  }
}, false);

Example 2: what are some javascript shortcuts

// If you want to write the code x=x+2, you can just go x += 2. 
// If you want to write the code x += 1, you can just go x++