WebRTC ICE 与 NAT 穿越：STUN/TURN 配置与连通性

概述ICE 通过候选收集与优选建立连接。STUN 提供公网映射发现，TURN 作为中继在受限网络提供连通。合理配置 `iceServers` 与策略提升成功率。用法/示例const pc = new RTCPeerConnection({ iceServers: [ { urls: 'stun:stun.l.google.com:19302' }, { urls: 'turn:turn.example.com:3478', username: 'user', credential: 'pass' } ], iceCandidatePoolSize: 0 }) pc.onicecandidate = e => { if (e.candidate) sendCandidate(e.candidate) } pc.onconnectionstatechange = () => console.log(pc.connectionState) 工程建议验证 TURN 证书与鉴权；在移动网络与企业网络进行连通性测试。采集 `iceConnectionState` 与候选类型统计，指导策略调整。控制带宽与编解码参数，避免过高码率导致脆弱网络下的劣化。参考与验证MDN：RTCPeerConnection — https://developer.mozilla.org/docs/Web/API/RTCPeerConnectionW3C：WebRTC — https://www.w3.org/TR/webrtc/