### 成员变量

类型: String

#### # static readonly failed

LoadStatus.failed，加载失败

Default Value:
  - 'failed'

类型: String

#### # static readonly loaded

LoadStatus.loaded，加载完毕

Default Value:
  - 'loaded'

类型: String

#### # static readonly loading

LoadStatus.loading，加载中

Default Value:
  - 'loading'

类型: String

#### # static readonly notLoaded

LoadStatus.notLoaded，未加载

Default Value:
  - 'not-loaded'