介绍： 实现特殊效果的按钮。按钮的形状类似物理键盘按钮，按钮未点击时是凸起状态，用户点击按钮，按钮会呈现压下去的效果，用户松开按钮，按钮又会凸起。-Introduction: achieving special effects button. Button shaped like a physical keyboard button, the button is not clicked raised state, the user clicks the button, the button wi