没有运算符，但是您可以使用pow函数，如下所示:

There isn't an operator but you can use the pow function like this:

return pow(num, power)

如果愿意，还可以让操作员像这样调用pow函数:

If you want to, you could also make an operator call the pow function like this:

infix operator ** { associativity left precedence 170 }

func ** (num: Double, power: Double) -> Double{
    return pow(num, power)
}

2.0**2.0 //4.0