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並前往https://betterprogramming.pub/javascript-interviews-whats-the-difference-between-a-variable-that-s-null-undefined-or-cb1c8f41e6c3

JavaScript Interviews: What's the Difference Between a ...

However, beware, null and undefined are loosely equal, but not strictly equal. This is because checking for loose equality coerces both to falsy . undefined == ...

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