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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Math/PI below:

Math.PI - JavaScript | MDN

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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。

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

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

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

由于 PI 是 Math 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）。

以下函数使用 Math.PI 来计算给定半径的圆周长。

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

calculateCircumference(1); // 6.283185307179586

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