tab切换列表显示，每个列表item都调用canvas画布，列表来回切换的时候，列表页面重复渲染，会导致canvas-id重复，那我可不可以获取到该指定id画布呢？或者清除所有canvas-id画布？求各路大神指教，急！在线等！！！！
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定义不同的id来渲染啊，或者单独抽离出这个canvas不随item变动