Matcher/pages/share/share.wxml

<view style="position:relative">
	<!-- <image src='{{bj}}' style="width:604rpx;height:512rpx;margin:100rpx 73rpx" />
	<image src="{{codeImg}}" style="position:absolute;top:328rpx;left:248rpx;width:220rpx;height:220rpx;"/> -->

	<canvas canvas-id="myCanvasId" style="width:604rpx;height:512rpx;margin:100rpx auto 30rpx auto;"></canvas>
	<button id="sunbmit" bindtap="save">保存二维码</button>
</view>