uni-app获取状态栏和导航栏高度

APP.vue

onLaunch: function() {
    uni.getSystemInfo({
        success: function(e) {
            let barHeight = 0;
            // #ifndef MP  
            if (e.platform == 'android') {
                barHeight = e.statusBarHeight + 50
            } else {
                barHeight = e.statusBarHeight + 45
            }
            // #endif

            // #ifdef MP-WEIXIN  
            let custom = wx.getMenuButtonBoundingClientRect()
            barHeight = custom.bottom + custom.top - e.statusBarHeight
            // #endif  

            // #ifdef MP-ALIPAY  
            barHeight = e.statusBarHeight + e.titleBarHeight
            // #endif

            // 本地缓存
            uni.setStorageSync('bar_height', barHeight);  // 状态栏加导航栏的高度
            uni.setStorageSync('screen_width', e.screenWidth);  // 屏幕宽度
        }
    })
}