mozilla开发社区上有 :active 不起作用的答案: [1] 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>. 在iOS系统的移动设备中,需要在按钮元素或body/html上绑定一个touchstart事件才能激活:active状态. document.b…