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
值
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_2
是 Math
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
使用 Math.SQRT1_2
规范
Specification |
---|
ECMAScript Language Specification # sec-math.sqrt1_2 |
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也可以看看
¥See also