JS 100元购物卡,牙刷5元,香皂2元、洗发水15元 100元正好花完有多少种可能
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> </body> </html> <script type="text/javascript"> var c = 0 var biao = 0 for(var x = 0;x <=20;x++){ for(var y = 0;y<=50;y++){ for(var z = 0;z<7;z++){ c++; if(5*x + 2*y + 15*z == 100){ biao++; } } } } alert(biao) </script>