#fix: 获取refs时没有判空 #367
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#fix: 获取refs时没有判空 #367
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tab快速切换时table报错，节点已经注销了去获取会报null：[codepen](https://codepen.io/coldq/pen/ZMNgrg)。 增加判空。
#fix: 获取refs时没有判空
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tab快速切换时table报错，节点已经注销了去获取会报null：codepen。
增加判空。