By default, Safari Mobile does not use the :active state unless there is a touchstart event handler on the relevant element or on the <body>.
意思在iOS设备上，需要在关联的元素，或其上级元素，或body/html元素上注册一个空的touchstart回调。
purejs
getElementById('myView').addEventListener('touchstart', () => {});
// or
document.body.addEventListener('touchstart', () => {});
vuejs
<div v-on:touchstart="() => {}"> xxx </div>
reactjs
<div onTouchStart={() => {}}> xxx </div>
。
