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並前往https://www.quora.com/When-using-indexOf-in-JavaScript-why-does-it-say-that-the-term-inside-the-parentheses-is-undefined

When using indexOf in JavaScript, why does it say ... - Quora

This is likely because “Javascript” does not yet have a value attached to it. Before you can call a variable in a program it must be defined and .indexOf ...

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