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本文描述是指从 8.9.x 升级至 9 的描述说明；NG-ALAIN 依然需要从三个部分来升级：

• Angula 并无什么破坏性变更，可以根据 Angular Update Guide | 8.0 -> 9.0 for Basic Apps 逐一检查升级
• NG-ZORRO 部分，本次也并无任何破坏性变更，只是移除在 8.x 时就已经警告的过期属性，绝大部分项目可以直接 ng update ng-zorro-antd 完成升级，有关更多可能遇到的问题请至 NG-ZORRO v9 升级指南。
• NG-ALAIN 如果你是 8.x 可以直接使用 `ng update ng

wenn you are in the disk usage in a Folder and you create, delete or make a change in it
the usage dont show the change
1.

only after i leave and return to the Folder