版本：6.0.1
- https://cdn.bootcdn.net/ajax/libs/acorn-walk/6.0.1/walk.es.js
- https://cdn.bootcdn.net/ajax/libs/acorn-walk/6.0.1/walk.es.min.js
- https://cdn.bootcdn.net/ajax/libs/acorn-walk/6.0.1/walk.js
- https://cdn.bootcdn.net/ajax/libs/acorn-walk/6.0.1/walk.min.js