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extends Animal后面不用加括号

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Gingbery

#1 Created at ... [Delete] [Delete and Lock User]

如果你运行报错TypeError: Class constructor Animal cannot be invoked without 'new'，可能你跟我一样在extends Animal后面加括号了。。。

Gary關

#2 Created at ... [Delete] [Delete and Lock User]

+1....

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