要计算圆的面积和周长,您可以尝试运行以下代码-
<html> <head> <title>JavaScript Example</title> </head> <body> <script> function Calculate(r) { this.r = r; this.perimeter = function () { return 2*Math.PI*this.r; }; this.area = function () { return Math.PI * this.r * this.r; }; } var calc = new Calculate(5); document.write("Area of Circle = ", calc.area().toFixed(2)); document.write("<br>Perimeter of Circle = ", calc.perimeter().toFixed(2)); </script> </body> </html>