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>大问题拆解为小问题，逐级向下拆解
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## 用循环实现斐波那契数列
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```javascript
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const Fibonacci_Cycle = (n: number): number => {
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if (n <= 0) return 0;
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if (n === 1) return n;
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let n1 = -1;
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let n2 = -1;
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let n3 = 0;
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for (let index = 0; index <= n; index++) {
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if (index === 0) {
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n1 = 0;
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n2 = 0;
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continue;
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}
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if (index === 1) {
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n1 = 0;
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n2 = 1;
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continue;
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}
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n3 = n1 + n2;
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n1 = n2;
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n2 = n3;
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}
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return n3;
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};
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```
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