在EntryAbility 类中的onWindowStageCreate（）方法中调用px2vp() api 不生效

export class Test{  
  public testPx2Vp() {  
    let result = px2vp(123);  
    console.log('resultresultresult'+result)  
  }  
  windowStage.loadContent('pages/Index', (err, data) => {  
  if (err.code) {  
  hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? '');  
  return;  
}  
let test1: Test= new Test();  
test1.testPx2Vp();  
hilog.info(0x0000, 'testTag', 'Succeeded in loading the content. Data: %{public}s', JSON.stringify(data) ?? '');  
});