css3点击提交按钮加载进度条动画特效

js代码

<script>
const button = document.querySelector(\'.button\');
const submit = document.querySelector(\'.submit\');

function toggleClass() {
	this.classList.toggle(\'active\');
}

function addClass() {
	this.classList.add(\'finished\');
}

button.addEventListener(\'click\', toggleClass);
button.addEventListener(\'transitionend\', toggleClass);
button.addEventListener(\'transitionend\', addClass);</script>

</body>