Ptt 大爆卦 | Js undefined == null - 前往 https://stackoverflow.com/questions/5076944/what-is-the-difference-between-null-and-undefined-in-javascript

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並前往https://stackoverflow.com/questions/5076944/what-is-the-difference-between-null-and-undefined-in-javascript

What is the difference between null and ... - Stack Overflow

Basically, Undefined is a global variable that javascript create at the run time whether null means that no value has assigned to the variable (actually null is ...

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