https://blog.csdn.net/henryhu712/article/details/82381287
https://www.cnblogs.com/ldj3/p/9120748.html
TypeError 之 Cannot convert undefined or null to object
https://www.cnblogs.com/sweet-ice/p/11328835.html
js 判断一个 object 对象是否为空
https://www.cnblogs.com/hjsblogs/p/10489433.html
https://www.cnblogs.com/feng-fengfeng/p/12409546.html
if (Object.keys(object).length === 0) {
return false // 如果为空,返回false
}
return true // 如果不为空，则会执行到这一步，返回true
微信小程序 揭秘wx.switchTab跳转方式会附带参数的问题！以及解决办法！
https://blog.csdn.net/qq_35610214/article/details/96619728
js对象数组和对象的使用实例详解
https://www.jb51.net/article/168615.htm
通过login获得的code从后台换取的userid，需要存到Storage里吗？
https://developers.weixin.qq.com/community/develop/doc/000a6422fa8a10dfbbb9ba4075f400
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