📅  最后修改于: 2022-03-11 15:03:15.958000             🧑  作者: Mango
let pass = document.getElementById('pass-one');
let count = document.getElementById('counter');
let maxLength = 10;
pass.setAttribute('maxlength', maxLength);
pass.addEventListener('input', () => {
count.innerText = `${pass.value.length}/${maxLength}`;
})