JS 实现1!+2!+3!+4!+5!+....+n!
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body> </body> </html> <script type="text/javascript"> var n = parseInt(prompt("请输入数字")); var z = 0 for(var i = 1;i<=n;i++){ for(var c = 0;c<i;c++){ var s =1 s=s*c s++ z=s+z } } document.write(z) </script>