wx.startWifi({
  success (res) {
    console.log(res)
      wx.getConnectedWifi({
            success: function(res) {
              console.log(res,"WIFI获取成功");
            },
            fail: function(res) {
              console.log(res,"WIFI获取失败");
            }
      });
  }
});
输出结果：
{"errMsg":"startWifi:ok"}
{errMsg: "getConnectedWifi:fail no wifi is connected."}
y已经连了wifi的