共计 181 个字符，预计需要花费 1 分钟才能阅读完成。
const shape = {
radius: 10,
diameter() {return this.radius * 2},
perimeter: () => 2 * Math.PI * this.radius}
shape.diameter()
shape.perimeter()A: 20 and 62.83185307179586
B: 20 and NaN
C: 20 and 63
D: NaN and 63
参考答案：
正文完
