Adding microphone sound to screen sharing

[msi008]

when screen sharing Setting up audio:true is error

var screen_constraints = { audio:true, video: { mandatory: { chromeMediaSource: error ? 'screen' : 'desktop', maxWidth: window.screen.width > 1280 ? window.screen.width : 1280, maxHeight: window.screen.height > 720 ? window.screen.height : 720 }, optional: [] } };
is error
Can I collect the microphone, how do I do it， Thank you