空文字
const n = document.getElementById('n') const r = document.getElementById('r') n.addEventListener('input', () => { r.textContent = n.value === '' ? '空文字' : n.value })
空文字
input[type="number"]::-webkit-outer-spin-button, input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; appearance: none; margin: 0; } input[type="number"] { -moz-appearance: textfield; appearance: textfield; }