如何获取屏幕宽高，你知道吗？

import { display } from '@kit.ArkUI'; 
// ... 
aboutToAppear() { 
  let displayClass: display.Display | null = null; 
  try { 
    displayClass = display.getDefaultDisplaySync(); 
    let width = displayClass.width 
    let height = displayClass.height 
  } catch (exception) { 
    console.error('Failed to obtain the default display object. Code: ' + JSON.stringify(exception)); 
  } 
}