feat: 新增传递this以提供自定义组件内可以渲染 #452
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文档参考: https://developers.weixin.qq.com/miniprogram/dev/api/canvas/wx.createCanvasContext.html CanvasContext wx.createCanvasContext(string canvasId, Object this) 在自定义组件下，当前组件实例的this，表示在这个自定义组件下查找拥有 canvas-id 的 canvas ，如果省略则不在任何自定义组件内查找
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文档参考:
https://developers.weixin.qq.com/miniprogram/dev/api/canvas/wx.createCanvasContext.html
CanvasContext wx.createCanvasContext(string canvasId, Object this)
在自定义组件下，当前组件实例的this，表示在这个自定义组件下查找拥有 canvas-id 的 canvas ，如果省略则不在任何自定义组件内查找