Math.PI

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Math.PI 静态数据属性表示圆的周长与直径的比例,其值约为 3.14159。

尝试一下

function calculateCircumference(radius) {
  return 2 * Math.PI * radius;
}

console.log(Math.PI);
// Expected output: 3.141592653589793

console.log(calculateCircumference(10));
// Expected output: 62.83185307179586

𝙼𝚊𝚝𝚑.𝙿𝙸=π3.14159\mathtt{Math.PI} = \pi \approx 3.14159
Math.PI 的属性特性
可写
可枚举
可配置

描述

由于 PIMath 的静态属性,因此应始终使用 Math.PI,而不是作为你创建的 Math 对象的属性(Math 不是构造函数)。

示例

使用 Math.PI

以下函数使用 Math.PI 来计算给定半径的圆周长。

js
function calculateCircumference(radius) {
  return Math.PI * (radius + radius);
}

calculateCircumference(1); // 6.283185307179586

规范

Specification
ECMAScript® 2025 Language Specification
# sec-math.pi

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
PI

Legend

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Full support
Full support

参见