#鸿蒙学习大百科#如何获取当前设备时sm，md，lg哪个尺寸的？

onWindowStageCreate(windowStage: window.WindowStage): void {
  windowStage.getMainWindow().then((data: window.Window) => {
    this.windowObj = data;
    this.updateBreakpoint(this.windowObj.getWindowProperties().windowRect.width,
      this.windowObj.getWindowProperties().windowRect.height);
    this.windowObj.on('windowSizeChange', (windowSize: window.Size) => {
      this.updateBreakpoint(windowSize.width, windowSize.height);
    })
  })
}

private windowObj?: window.Window;
private updateBreakpoint(windowWidth: number, windowHeight: number): void {
  let windowWidthVp = windowWidth / display.getDefaultDisplaySync().densityPixels;
  let curBp: string = '';
  if (windowWidthVp < 600) {
    curBp = 'sm';
  } else if (windowWidthVp < 840) {
    curBp = 'md';
  } else {
    curBp = 'lg';
  }
  AppStorage.setOrCreate('breakPoint', curBp);
  AppStorage.setOrCreate('windowSize', windowWidth / display.getDefaultDisplaySync().densityPixels);
  AppStorage.setOrCreate('windowSizeHeight', windowHeight / display.getDefaultDisplaySync().densityPixels);
};