<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function jiecheng(n){
            if(n==1){
                return 1;


            }
            return n*jiecheng(n-1)

        }
        var sum=jiecheng(5)
        console.log(sum)
    </script>
</body>
</html>

效果

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