<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>返回平均分</title> <script type="text/javascript"> function avg() { var avg=0; for (var i=0;i<arguments.length;i++) { //所有的成绩之和 avg+=parseFloat(arguments[i]); } return avg/arguments.length; } alert('平均分数是'+avg(50,60,70,80,90,90)) </script> </head> <body> </body> </html>