请使用原生的js实现斐波那契数列

let Fibonacci = num => {    if (!Fibonacci.sequence) Fibonacci.sequence = [1, 1]    if (Fibonacci.sequence[num] !== undefined) return Fibonacci.sequence.slice(0, num)    for (var i = Fibonacci.sequence.length; i < num + 1; i++) {        Fibonacci.sequence[i] = Fibonacci.sequence[i - 1] + Fibonacci.sequence[i - 2]    }    return Fibonacci.sequence.slice(0, num)}

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