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canvas，两个组件渲染问题
模拟器中，A组件，B组件中，canvas独立不受影响
真机中：A组件无canvas渲染的情况，会被B组件中相同索引的canvas覆盖。（如抢光了，此处为一张图片，无canvas。真机中会被B组件中相同索引的canvas覆盖）
注：两个组件，已使用不同的canvasId处理。
