<!DOCTYPE html>
<html lang="en">
<head>
???<meta charset="UTF-8">
???<title>Title</title>
???<script>
???????/*实现1!+2!+3!+4!+5!+....+n!*/
??????var n = parseInt(prompt("请输入数字"));
??????var z = 0;
??????for(var i = 1;i<=n;i++){
?????????for(var j = 0;j<i;j++){
????????????var s =1;
????????????s=s*j;
????????????s++;
????????????z=s+z
?????????}
??????}
??????document.write(z)
???</script>
</head>
<body>
</body>
</html>
Js 实现1!+2!+3!+4!+5!+....+n!
原文地址：https://www.cnblogs.com/maimaiti/p/10553796.html