Math.LOG2E
Math.LOG2E
Math.LOG2E
属性表示以 2 为底数,e 的对数,约为 1.442:
Math.LOG2E=log2(e)≈1.442\mathtt{\mi{Math.LOG2E}} = \log_2(e) \approx 1.442
| Math.LOG2E
属性的属性特性 |
|:----|
| Writable | no |
| Enumerable | no |
| Configurable | no |
描述
由于LOG2E
是Math
的静态属性,所以应该像这样使用:Math.LOG2E
,而不是作为你创建的 Math
对象的属性(Math
不是一个构造函数)。
示例
使用Math.LOG2E
下面的函数返回以 2 为底数,E 的对数:
function getLog2e() {
return Math.LOG2E;
}
getLog2e( // 1.4426950408889634
规范
Specification | Status | Comment |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0. |
ECMAScript 5.1 (ECMA-262)The definition of 'Math.LOG2E' in that specification. | Standard | |
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'Math.LOG2E' in that specification. | Standard | |
ECMAScript Latest Draft (ECMA-262)The definition of 'Math.LOG2E' in that specification. | Draft | |
浏览器兼容性
Feature | Chrome | Firefox | Edge | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |