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Math.sqrt() - JavaScript | MDN
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Math.sqrt()

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 7.

Math.sqrt() .

x0,Math.sqrt(x)=x=the uniquey0such thaty2=x\forall x \geq 0, \mathtt{Math.sqrt(x)} = \sqrt{x} = \text{the unique} ; y \geq 0 ; \text{such that} ; y^2 = x

In this article

js
Math.sqrt(x);

x

.

( ) . NaN .

x Math.sqrt() NaN .

sqrt() Math Math Math.sqrt() . (Math .)

Math.sqrt()

js
Math.sqrt(9); // 3
Math.sqrt(2); // 1.414213562373095

Math.sqrt(1); // 1
Math.sqrt(0); // 0
Math.sqrt(-1); // NaN

Specification
ECMAScript 2027 LanguageSpecification
# sec-math.sqrt

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