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                                            godokyang

wepy2.0-在组件中使用canvas，createCanvasContext不能获取到正确的对象

PS： 1. 我已经在组件中调用createCanvasContext的时候传了当前的this 2. page中可以正常使用createCanvasContext ComponentUI ![image](https://user-images.githubusercontent.com/6251339/63011588-2fb40700-bebb-11e9-8597-6e9a13730d49.png) Component attached ![image](https://user-images.githubusercontent.com/6251339/63011622-435f6d80-bebb-11e9-97d5-e31952b68828.png) page中引入 ![image](https://user-images.githubusercontent.com/6251339/63011659-570ad400-bebb-11e9-8bac-283e2ccb1746.png) ![image](https://user-images.githubusercontent.com/6251339/63011700-67bb4a00-bebb-11e9-9ca1-630594d6aa0f.png)