wx.setTabBarBadge不能在wx.onSocketMessage里吗wx.onSocketMessage(function (res) {
console.log('收到服务器内容：' + res.data)
wx.setTabBarBadge({
index: 2,
text: '2',
complete: function (a) {
console.log(a)
}
});
}) 报错：{errMsg: "setTabBarBadge:fail not TabBar page"}
