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>

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