The applet rewrites the button background

<button plain="true" open-type='share' class="share-button" style="background-image:url(/images/icon/goods_share.png);" plain='true'>

</button>

 

.share-button{

width: 34rpx;

height: 34rpx;

position: absolute;

right:102rpx;

top: 0;

bottom: 0;

left:136rpx;

margin: auto;

background-size: 34rpx 34rpx;

background-repeat:no-repeat;

border:none;

}