webveuje/js/demo/digui.html
2021-03-23 10:58:10 +08:00

29 lines
567 B
HTML

<!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 a(n) {
if (n <= 1) {
return 1
} else {
return n * a(n - 1)
}
}
console.log(a(5)) //120
var cheng=a
a=null
console.log(cheng(5))// : a is not a function
</script>
</body>
</html>