<view class="snapshoot-page">
    <image class="card" src="{{canvasSrc}}" style="width: {{snapWidth}}px;height:{{snapHeight}}px;"></image>
    <canvas canvas-id="cardCanvas"
            style="width: {{snapWidth}}px;height:{{snapHeight}}px;position:fixed;top: 3000px;left: 2000rpx;"></canvas>
    <view wx:if="{{canvasSrc}}" class="btn active" type="plain" bindtap="save">保存到相册</view>
    <view wx:if="{{canvasSrc}}" class="btn" type="plain" bindtap="cancel">取消</view>
</view>