微信小程序按钮去除边框线分享页面功能

<button open-type="share" style="height:85rpx;width:215rpx;padding:0;background-color:#fff;border-color:#fff;margin-right:10rpx" ><image style="height:85rpx;width:215rpx;" src='../../../image/share_btn.png'></image></button>

button::after{border: none;}

 /**  * 用户点击分享  */ onShareAppMessage: function () {  return {    title: '分享',   desc: '活动描述',    path: '/xxx/xxxx?id=' + this.data.id  }  },

 wxml<button class='niu'>123123</button>cssniu::after{　　border:none;}