```

const query = wx.createSelectorQuery();

query.select(’#canvas_cinema’)

 .fields({ node: true, size: true })

         .exec((res) => {

                console.log(‘初始化画布>>>’, res);

           })

```

微信版本: 8.0.2

iOS报错: `n.Canvas is not a constructor`

Android报错: `can not read property ‘createView’`

以上错误造成canvas 2d 无法绘制图片