//获取用户的授权信息，放到本地缓存中
  wx.getSetting({
   success: (res) => {
    if(res.authSetting['scope.userInfo'])
    {
     wx.setStorage({
      key: 'can_getuserinfo',
      data: 1,
     })
    }
    else
    {
     wx.setStorage({
      key: 'can_getuserinfo',
      data: 0,
     })
    }
   }
  }),
  //1:从本地缓存中获取数据，如果获取到根据结果显示Index页面的授权按钮是否显示，
  //2:如果从本地缓存获取不到数据则说明用户清空了本地数据，默认设置为0，让用户重新授权
  wx.getStorage({
   key: 'can_getuserinfo',
   success: function (res) { 
    console.log(res.data);
    that.setData({
     can_getuserinfo:res.data
    })
   },fail:function()
   {
    that.setData({
     can_getuserinfo: 0
    })
   }
  })
  
 },

<view wx:if="{{can_getuserinfo==0}}">
<text>\n</text>
<text>\n</text>
<text>\n</text>
<button wx:if="{{canIUse}}" open-type="getUserInfo" bindgetuserinfo="bindGetUserInfo">授权登录</button>
<view wx:else>请升级微信版本</view>
</view>