This project forked from chianz/wechatminiappcanvas
微信小程序转发到朋友圈生成小程序码图文保存
微信小程序 canvas生成分享图 保存到相册发票圈 Demo
1. 二维码如果带有参数 就有服务端发送过来 我们需要的只是图片的url；
2. 把用到的图片和文字绘制到画布上 wx.createCanvasContext()；
3. 用户点击生成分享图的时候。把画布转成图片wx.canvasToTempFilePath()一直到这里，以上操作对用户都是不可见的,此时生成图片后API会返回图片的路径url，这时可以把拿到的图片url放到一个<image>里展示给用户了；
4. 再来一个按钮把展示的图片调用wx.saveImageToPhotosAlbum()保存到相册中，完结撒花；
更详细的解释见 微信小程序 canvas生成分享图
任何问题欢迎留言
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