https://developers.weixin.qq.com/miniprogram/dev/api/base/system/system-info/wx.getSystemInfo.html
获取它的高度是要干嘛呢
你好,请参考https://developers.weixin.qq.com/miniprogram/dev/extended/weui/tabbar.html#%E7%A4%BA%E4%BE%8B%E4%BB%A3%E7%A0%81