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function nthroot(x, n)
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{
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ng = n % 2;
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if((ng == 1) || x<0)
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x = -x;
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var r = Math.pow(x, 1 / n);
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n = Math.pow(r, n);
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if(Math.abs(x - n) < 1 && (x > 0 === n > 0))
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return ng ? -r : r;
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}
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console.log(nthroot(64, 2));
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console.log(nthroot(64, -2));
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