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Math.E

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

SpecificationStatusComment
ECMAScript 1st Edition (ECMA-262)StandardInitial 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

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