JavaScript参考手册
Math
Math.E
Math.E
属性表示自然对数的底数(或称为基数),e,约等于 2.718。
Math.E=e≈2.718\mathtt{\mi{Math.E}} = e \approx 2.718
| Math.E
属性的属性特性 |
|:----|
| Writable | no |
| Enumerable | no |
| Configurable | no |
描述
Because E
is a static property of Math
, you always use it as Math.E
, rather than as a property of a Math
object you created (Math
is not a constructor).
示例
使用Math.E
下面的函数返回 e:
function getNapier() {
return Math.E;
}
getNapier(); // 2.718281828459045
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.E' in that specification. |
Standard |
|
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'Math.E' in that specification. |
Standard |
|
ECMAScript Latest Draft (ECMA-262)The definition of 'Math.E' 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) |
Math相关
JavaScript 是一种高级编程语言,通过解释执行,是一门动态类型,面向对象(基于原型)的解释型语言。它已经由ECMA(欧洲电脑制造商协会)通过 ECMAScript 实现语言的标准化。它被世界上的绝大多数网站所使用,也被世界主流浏览器( Chrome、IE、FireFox、Safari、Opera )支持。JavaScript 是一门基于原型、函数先行的语言,是一门多范式的语言,它支持面向对象编程,命令式编程,以及函数式编程。它提供语法来操控文本、数组、日期以及正则表达式等,不支持 I/O,比如网络