正常新建一个登录页面

 创建首页和TatBar，实现登录后底部出现两个按钮

代码

"pages": ["pages/login/index","pages/index/index","pages/logs/logs"    ],"tabBar": {"list": [{"pagePath": "pages/index/index","text": "首页","iconPath": "res/images/tab/home.png","selectedIconPath": "res/images/tab/home-select.png"},{"pagePath": "pages/logs/logs",    "text": "日志","iconPath": "res/images/tab/home.png","selectedIconPath": "res/images/tab/home-select.png"}]},

把Login页面放在Page的第一个，这样程序进来默认就会打开登录页面。

登录成功后使用下面的方式跳转到首页

 wx.switchTab({url: '../index/index'})

如果想要在首页上面加一条灰色的线，可以在app全局样式里面添加下面代码

page::after{content: '';position: fixed;left: 0;bottom: 0;width: 100%;height: 1px;background-color: #E7E7E7;z-index: 9999;
}