看這個鏈接 https://juejin.im/entry/58f6d9fb44d904006c121d2e
移動端:active僞類無效的解決方法:
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>
看來在iOS系統的移動設備中，需要在按鈕元素或body/html上綁定一個touchstart事件才能激活:active狀態。
document.body.addEventListener('touchstart', function () { //...空函數即可});