如何锁定设备竖屏，使得窗口不随屏幕旋转
===================

使用setPreferredOrientation方法锁定竖屏，设置orientation为window.Orientation.PORTRAIT。参考代码如下：

_//1.Get the window instance object, use the createWindow method to create a new window, and use the findWindow method to obtain an existing window_
let windowClass: window.Window | undefined = undefined;
let config: window.Configuration = {
  name: "alertWindow",
  windowType: window.WindowType.TYPE\_SYSTEM\_ALERT,
  ctx: this.context
};
try {
  let promise = window.createWindow(config);
  promise.then((data)=> {
    windowClass = data;
    console.info('Succeeded in creating the window. Data:' + JSON.stringify(data));
  }).catch((err: BusinessError)=>{
    console.error('Failed to create the Window. Cause:' + JSON.stringify(err));
  });} catch (exception) {
  console.error('Failed to create the window. Cause: ' + JSON.stringify(exception));
}
_//2.The window instance uses the setPreferred Orientation method to set the display orientation of the window. PORTRAIT is a fixed vertical screen, and other orientations can refer to the reference link_
let orientation = window.Orientation.PORTRAIT;
try {
  let windowClass: window.Window = window.findWindow("test");
  windowClass.setPreferredOrientation(orientation, (err: BusinessError) => {
    const errCode: number = err.code;
    if (errCode) {
      console.error('Failed to set window orientation. Cause: ' + JSON.stringify(err));
      return;
    }
    console.info('Succeeded in setting window orientation.');
  });
} catch (exception) {
  console.error('Failed to set window orientation. Cause: ' + JSON.stringify(exception));
}

**参考链接**

[Orientation](https://developer.huawei.com/consumer/cn/doc/harmonyos-references/js-apis-display#orientation10)