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並前往https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

Array.prototype.splice() - JavaScript - MDN Web Docs

inserts at index 1. 4. console.log(months);. 5. // expected output: Array ["Jan", "Feb", "March", "April", "June"]. 6. ​. 7. months.splice(4, 1, 'May');.

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