应用开发时如何全局保存变量，在ets文件中使用 - HarmonyOS 鸿蒙Next

保存全局变量可以使用GlobalContext对象，例：保存本应用的文件路径到全局对象中：

GlobalContext.getContext().setObject(‘applicationPathDir’, applicationPathDir);<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

后面取用该路径：

let applicationPathDir: string = GlobalContext.getContext().getObject(‘applicationPathDir’) as string;<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

其中GlobalContext对象的代码如下：

export class GlobalContext {

  private constructor() {
  }
  private static instance: GlobalContext;
  private _object = new Map<string, object>();
  public static getContext(): GlobalContext {
    if (!GlobalContext.instance) {
      GlobalContext.instance = new GlobalContext();
    }
    return GlobalContext.instance;
  }
  getObject(value: string): Object | undefined {
    return this._object.get(value);
  }
  setObject(key: string, objectClass: Object): void {
    this._object.set(key, objectClass)
  }
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>