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) |
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