HarmonyOS 如何弹出一个toast

可以参考如下demo:

import promptAction from '@ohos.promptAction'
import { BusinessError } from '@ohos.base';

@Entry
@Component
struct toastExample {
  build() {
    Column() {
      Button('Show toast').fontSize(20)
        .onClick(() => {
          try {
            promptAction.showToast({
              message: 'Hello World',
              duration: 2000
            });
          } catch (error) {
            let message = (error as BusinessError).message
            let code = (error as BusinessError).code
            console.error(`showToast args error code is ${code}, message is ${message}`);
          };
        })
    }.height('100%').width('100%').justifyContent(FlexAlign.Center)
  }
}