open的时候报错

wx.onSocketOpen(function(res){ 

     console.log("WebSocket连接已打开!");

});

先停止Nginx (windows 版)
tasklist | findstr nginx（查看nginx进程）

taskkill /pid xxxx /F (杀进程)

location /st2 {

        root  html;

        index  index.html index.htm;

        proxy_pass http://xxxxxxxx:xxxx/;

        proxy_http_version 1.1;

        proxy_set_header Upgrade $http_upgrade;

        proxy_set_header Connection "Upgrade";

}

加上这三句

        proxy_http_version 1.1;

        proxy_set_header Upgrade $http_upgrade;

        proxy_set_header Connection "Upgrade";

问题解决（这是其中一种情况）