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® 2025 Language Specification
# sec-math.log2

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
log2

Legend

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Full support
Full support

参见