python双星号什么运算_双星号**是一个有效的Javascript运算符吗？

I solved a kata on codewars and was looking through some of the other solutions when I came across the double asterisk to signify to the power of. I have done some research and can see that this is a valid operator in python but can see nothing about it in JavaScript documentation.

var findNb = m =>

{

var n = Math.floor((4*m)**.25);

var sum = x => (x*(x+1)/2)**2;

return sum(n) == m ? n : -1;

}

Yet when I run this solution on codewars, it seems to work. I am wondering if this is new in ES6, although I have found nothing about it.

解决方案

Yes. ** is the exponentiation operator and is the equivalent of Math.pow.

It was introduced in ECMAScript 2016 (ES7).

For details, see the proposal and this chapter of Exploring ES2016.