<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>范例6-2</title> </head> <body> <script language="javascript"> var circularityArea = new Function( "r", "return r*r*Math.PI" ); // 创建一个函数对象 var rCircle = 2; // 给定圆的半径 var area = circularityArea(rCircle); // 使用求圆面积的函数求面积 alert( "半径为2的圆面积为：" + area ); // 输出结果 </script> </body> </html>