How i create peer-connection without localStream?

I just want achieve one client send mediaSteam and another received the mediaSteam. So Receiver client needn't add localSteam.and i just code pc.addStream(null).But not work. How i achieve this by WebRtc?

Don't call pc.addStream with null. Instead, just don't call it.

• When the receiver is also the answerer, this is all there is to it.
• When the receiver is the offerer, you need a little extra work:

You need to specify these RTCOfferOptions to createOffer:

{ offerToReceiveVideo: true, offerToReceiveAudio: true }

The reason is that by default, the offerer only offers to receive the same kinds of streams it is sending. I know, a dumb default, but it gives the offerer a bit more control. On the upside, there's no harm in always specifying these options, if it matches your desired behavior.