说明：在DevEco Studio中创建的UIAbility中，该UIAbility实例默认会加载Index页面，根据需要将Index页面路径替换为需要的页面路径即可。

• 在UIAbility中可以通过this.context获取UIAbility实例的上下文信息。
  import UIAbility from '@ohos.app.ability.UIAbility';import AbilityConstant from '@ohos.app.ability.AbilityConstant';import Want from '@ohos.app.ability.Want';export default class EntryAbility extends UIAbility {  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {    // 获取UIAbility实例的上下文    let context = this.context;    ...  }}
  
• 在页面中获取UIAbility实例的上下文信息，包括导入依赖资源context模块和在组件中定义一个context变量两个部分。
  import common from '@ohos.app.ability.common';import Want from '@ohos.app.ability.Want';@Entry@Componentstruct Index {  private context = getContext(this) as common.UIAbilityContext;  startAbilityTest() {    let want: Want = {      // Want参数信息    };    this.context.startAbility(want);  }  // 页面展示  build() {    ...  }}也可以在导入依赖资源context模块后，在具体使用UIAbilityContext前进行变量定义。
  import common from '@ohos.app.ability.common';import Want from '@ohos.app.ability.Want';@Entry@Componentstruct Index {  startAbilityTest() {    let context = getContext(this) as common.UIAbilityContext;    let want: Want = {      // Want参数信息    };    context.startAbility(want);  }  // 页面展示  build() {    ...  }}