http/https与websocket的ws/wss的关系

1.对应关系

http -> new WebSocket('ws://xxx')

https -> new WebSocket('wss://xxx')

2.兼容解决方案

var protocol = location.protocol === 'https:' 
    ? 'wss://localhost:8888' 
    : 'ws://localhost:8889';
new WebSocket(protocol);