我把源码和效果图给你看看 [图片] wxml: <button class='btn' plain='true' bindtap='clkMinus' data-index='{{index}}'>     <image src='/icon/minus.png' mode='aspectFit' class="btn_bg"></image> </button> wxss: .btn{ position:absolute; float:right; border:0px solid red; right:25px; width:20px; height:20px; } .btn::after{ border: none; } [图片] wxml: <button class='btn' plain='true' bindtap='clkMinus' data-index='{{index}}'>     <image src='/icon/minus.png' mode='aspectFit' class="btn_bg"></image> </button> wxss: .btn{ position:absolute; float:right; border:0px solid red; right:25px; width:20px; height:20px; } .button::after{ border: none; } [图片] wxml: <button style='position:absolute;float:right;border:0px solid red;right:25px;width:20px;height:20px;' plain='true' bindtap='clkMinus' data-index='{{index}}'>     <image src='/icon/minus.png' mode='aspectFit' class="btn_bg"></image> </button> .btn::after{     border:none; } 和.button::after{     border:none; } 我都试过，没有效果，倒是直接在style里设置边框0px有效果