Math.SQRT1_2

Math.SQRT1_2 静态数据属性表示 1/2 的平方根,约为 0.707。

¥The Math.SQRT1_2 static data property represents the square root of 1/2, which is approximately 0.707.

Try it

¥Value

𝙼𝚊𝚝𝚑.𝚂𝚀𝚁𝚃𝟷_𝟸 = 1 2 0.707 \mathtt{Math.SQRT1_2} = \sqrt{\frac{1}{2}} \approx 0.707

Property attributes of Math.SQRT1_2
Writable no
Enumerable no
Configurable no

描述

¥Description

Math.SQRT1_2 是一个常量,与 Math.sqrt(0.5) 等效,性能更高。

¥Math.SQRT1_2 is a constant and a more performant equivalent to Math.sqrt(0.5).

因为 SQRT1_2Math 的静态属性,所以你始终将其用作 Math.SQRT1_2,而不是用作你创建的 Math 对象的属性(Math 不是构造函数)。

¥Because SQRT1_2 is a static property of Math, you always use it as Math.SQRT1_2, rather than as a property of a Math object you created (Math is not a constructor).

示例

¥Examples

使用 Math.SQRT1_2

¥Using Math.SQRT1_2

以下函数返回 1 除以 2 的平方根:

¥The following function returns 1 over the square root of 2:

js
function getRoot1_2() {
  return Math.SQRT1_2;
}

getRoot1_2(); // 0.7071067811865476

规范

Specification
ECMAScript Language Specification
# sec-math.sqrt1_2

¥Specifications

浏览器兼容性

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¥Browser compatibility

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