Math.SQRT2
Math.SQRT2属性表示 2 的平方根，约为 1.414：
Math.SQRT2 =2≈1.414\ mathtt {\ mi {Math.SQRT2}} = \ sqrt {2} \ approx 1.414
| Math.SQRT2的属性特性 |
|:----|
| Writable | no |
| Enumerable | no |
| Configurable | no |
描述
由于?SQRT2?是?Math?的静态属性，所以应该像这样使用：Math.SQRT2，而不是作为你创建的Math实例的属性（Math不是构造函数）。
示例
使用Math.SQRT2
下面的函数返回 2 的平方根：
function getRoot2() {
return Math.SQRT2;
}
getRoot2(); // 1.4142135623730951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.SQRT2' in that specification. | Standard | ? |
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'Math.SQRT2' in that specification. | Standard | ? |
ECMAScript Latest Draft (ECMA-262)The definition of 'Math.SQRT2' 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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