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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Math/sqrt below:

Math.sqrt() - JavaScript | MDN

Math.sqrt()

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Math.sqrt() 函数返回一个数的平方根，即：

∀ x ≥ 0 , M a t h . s q r t ( x ) = x = the unique y ≥ 0 such that y2 = x \forall x \geq 0, \mathtt{Math.sqrt(x)} = \sqrt{x} = \text{the unique} ; y \geq 0 ; \text{such that} ; y^2 = x 尝试一下 
function calcHypotenuse(a, b) {
  return Math.sqrt(a * a + b * b);
}

console.log(calcHypotenuse(3, 4));
// Expected output: 5

console.log(calcHypotenuse(5, 12));
// Expected output: 13

console.log(calcHypotenuse(0, 0));
// Expected output: 0
语法 参数 描述

如果参数 number 为负值，则 sqrt 返回NaN。

由于 sqrt 是 Math 的静态方法，所以应该像这样使用：Math.sqrt()，而不是作为你创建的 Math 实例的方法。

示例 使用 Math.sqrt 
Math.sqrt(9); // 3
Math.sqrt(2); // 1.414213562373095

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