设置子窗口透明度未生效

window.moveWindowTo(0, yPos); 
window.resize(windowWidth, windowHeight); 
window.setUIContent('pages/Index') 
window.showWindow().then(() => { 
  this.isSubWindowShow = true; 
  UPDataEngine.getInstance().setupmpWindow(window); 
  window.setWindowBackgroundColor("#00000000") 
}).catch(err => { 
  UPLog.info(TAG, JSON.stringify(err)); 
})
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