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Recursive Function
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| function countDown(fromNumber) { | |
| console.log(fromNumber) | |
| let nextNumber = fromNumber - 1 | |
| if (nextNumber > 0) { | |
| countDown(nextNumber) // 呼叫自己 | |
| } | |
| } | |
| countDown(5) | |
| // Output | |
| // 5 | |
| // 4 | |
| // 3 | |
| // 2 | |
| // 1 |
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