Math.LOG2E - JavaScript 编辑

The Math.LOG2E property represents the base 2 logarithm of e, approximately 1.442:

$$\mathtt{\mi{Math.LOG2E}} = \log_2(e) \approx 1.442$$

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Property attributes of Math.LOG2E
Writable	no
Enumerable	no
Configurable	no

Description

Because LOG2E is a static property of Math, you always use it as Math.LOG2E, rather than as a property of a Math object you created (Math is not a constructor).

Examples

Using Math.LOG2E

The following function returns the base 2 logarithm of e:

function getLog2e() {
  return Math.LOG2E;
}

getLog2e(); // 1.4426950408889634

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'Math.LOG2E' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

• Math.exp()
• Math.log()
• Math.log2()