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並前往https://stackoverflow.com/questions/175739/built-in-way-in-javascript-to-check-if-a-string-is-a-valid-number

(Built-in) way in JavaScript to check if a string is a valid number

2019: Practical and tight numerical validity check · Best way for check if it's a number: isFinite(20) //True · Read a value out of a string. CSS *: parseInt('2.5 ...

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