HarmonyOS 如何获取屏幕分辨率？

let displayClass: Array<display.Display> =[];  
let promise: Promise<Array<display.Display>> = display.getAllDisplays();  
promise.then((data: Array<display.Display>) => {  
  displayClass = data;  
  console.info('Succeeded in obtaining all the display objects. Data: ' + JSON.stringify(data));  
}).catch((err: BusinessError) => {  
  console.error('Failed to obtain all the display objects. Code: ' + JSON.stringify(err));  
});