用边框写一个有尖角的图形

效果图

css:

.wrap{
  display: flex;
  justify-content: center;
}
.label_item{
  display: flex;
  align-items: center;
}
.label_empty{
  width: 0;
  height: 0;
  border-bottom:17rpx solid transparent;
  border-right: 17rpx solid #d2d2d2;
border-top: 17rpx solid transparent;
position: relative;
}
.icon{
  display: block;
width: 0;
height: 0;
border-bottom: 25rpx solid transparent;
border-right: 25rpx solid #fff;
border-top: 25rpx solid transparent;
position: absolute;
left: 2rpx;
top: -24rpx;
display: inline-block;
}
.idea{
    height: 26rpx;
    line-height: 26rpx;
    padding-left: 10rpx;
    padding-right: 10rpx;
    border: 1rpx solid #d2d2d2;
    font-size: 18rpx;
    color: #90c42f;
    border-left: none;
    display: inline-block;
    position: relative;
  }

.wxml:

<view class='wrap'>
    <view class='label_item'>
        <view class='label_empty'>
            <view class='icon'></view>
        </view>
        <view class='idea'>标签</view>
    </view>
</view>