自定义导航栏的高度计算
const sysInfo = wx.getWindowInfo()
const menuInfo = wx.getMenuButtonBoundingClientRect()
// 导航栏高度
const navigationBarHeight = (menuInfo.top - sysInfo.statusBarHeight) * 2 + menuInfo.height
// 状态栏高度
const statusBarHeight = sysInfo.statusBarHeight