Math.log2()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
概述
Math.log2() 函数返回一个数字以 2 为底的对数。
语法
Math.log2(x)
参数
x-
任意数字。
描述
如果传入的参数小于 0，则返回 NaN.
示例
js
Math.log2(2); // 1
Math.log2(1024); // 10
Math.log2(1); // 0
Math.log2(0); // -Infinity
Math.log2(-2); // NaN
Math.log2("1024"); // 10
Math.log2("foo"); // NaN
规范
| Specification |
|---|
| ECMAScript Language Specification # sec-math.log2 |
浏览器兼容性
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