题解 | 计数器
计数器
https://www.nowcoder.com/practice/59154c37d06c41b5b0e19b3b26272229
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
</head>
<body>
<script type="text/javascript">
const closure = () => {
// 补全代码
let num = 1;
return function () {
return num++;
};
};
</script>
</body>
</html>