版本：6.1.0
- https://cdn.bootcdn.net/ajax/libs/acorn-walk/6.1.0/walk.es.js
- https://cdn.bootcdn.net/ajax/libs/acorn-walk/6.1.0/walk.es.min.js
- https://cdn.bootcdn.net/ajax/libs/acorn-walk/6.1.0/walk.js
- https://cdn.bootcdn.net/ajax/libs/acorn-walk/6.1.0/walk.min.js