Write a generator function that returns a generator object which yields the fibonacci sequence.
\n\nThe fibonacci sequence is defined by the relation Xn = Xn-1 + Xn-2.
The first few numbers of the series are 0, 1, 1, 2, 3, 5, 8, 13.
\n
Example 1:
\n\n\nInput: callCount = 5\nOutput: [0,1,1,2,3]\nExplanation:\nconst gen = fibGenerator();\ngen.next().value; // 0\ngen.next().value; // 1\ngen.next().value; // 1\ngen.next().value; // 2\ngen.next().value; // 3\n\n\n
Example 2:
\n\n\nInput: callCount = 0\nOutput: []\nExplanation: gen.next() is never called so nothing is outputted\n\n\n
\n
Constraints:
\n\n0 <= callCount <= 50请你编写一个生成器函数，并返回一个可以生成 斐波那契数列 的生成器对象。
\n\n斐波那契数列 的递推公式为 Xn = Xn-1 + Xn-2 。
这个数列的前几个数字是 0, 1, 1, 2, 3, 5, 8, 13 。
\n\n
示例 1：
\n\n\n输入：callCount = 5\n输出：[0,1,1,2,3]\n解释：\nconst gen = fibGenerator();\ngen.next().value; // 0\ngen.next().value; // 1\ngen.next().value; // 1\ngen.next().value; // 2\ngen.next().value; // 3\n\n\n
示例 2：
\n\n\n输入：callCount = 0\n输出：[]\n解释：gen.next() 永远不会被调用，所以什么也不会输出\n\n\n
\n\n
提示：
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