elementuitree递归增加删除文件文件夹

element-ui tree，递归增加、删除文件/文件夹

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-06-15 07:23  vue_tree-master\
     文件         197  2018-06-15 07:23  vue_tree-master\.babelrc
     文件          36  2018-06-15 07:23  vue_tree-master\.gitignore
     文件         494  2018-06-15 07:23  vue_tree-master\README.md
     文件        1802  2018-06-15 07:23  vue_tree-master\app.js
     目录           0  2018-06-15 07:23  vue_tree-master\bin\
     文件        1594  2018-06-15 07:23  vue_tree-master\bin\www
     目录           0  2018-06-15 07:23  vue_tree-master\build\
     文件        1729  2018-06-15 07:23  vue_tree-master\build\webpack.dev.config.js
     文件         480  2018-06-15 07:23  vue_tree-master\build\webpack.pro.config.js
     文件         176  2018-06-15 07:23  vue_tree-master\index.html
     文件      280980  2018-06-15 07:23  vue_tree-master\package-lock.json
     文件        1180  2018-06-15 07:23  vue_tree-master\package.json
     目录           0  2018-06-15 07:23  vue_tree-master\public\
     目录           0  2018-06-15 07:23  vue_tree-master\public\stylesheets\
     文件         111  2018-06-15 07:23  vue_tree-master\public\stylesheets\style.css
     目录           0  2018-06-15 07:23  vue_tree-master\server\
     目录           0  2018-06-15 07:23  vue_tree-master\server\routes\
     文件         205  2018-06-15 07:23  vue_tree-master\server\routes\index.js
     文件         203  2018-06-15 07:23  vue_tree-master\server\routes\users.js
     目录           0  2018-06-15 07:23  vue_tree-master\server\views\
     文件          83  2018-06-15 07:23  vue_tree-master\server\views\error.ejs
     文件         222  2018-06-15 07:23  vue_tree-master\server\views\index.ejs
     目录           0  2018-06-15 07:23  vue_tree-master\src\
     文件         266  2018-06-15 07:23  vue_tree-master\src\App.vue
     目录           0  2018-06-15 07:23  vue_tree-master\src\components\
     文件        2828  2018-06-15 07:23  vue_tree-master\src\components\TreeItem.vue
     文件        8322  2018-06-15 07:23  vue_tree-master\src\components\a.vue
     文件         385  2018-06-15 07:23  vue_tree-master\src\main.js
     目录           0  2018-06-15 07:23  vue_tree-master\src\router\
     文件         501  2018-06-15 07:23  vue_tree-master\src\router\index.js
............此处省略35个文件信息