fix: add an if statement before calling the unmountComponentAtNode#319
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fix: add an if statement before calling the unmountComponentAtNode#319
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简介
执行
unmountComponentAtNode方法时，添加 if 声明主要变更
if条件判断contentContainer是否存在，不存在的情况下，执行unmountComponentAtNode会导致 React 异常，页面白屏