"tabBar": {     "position":"bottom",     "list": [{       "pagePath": "pages/logs/logs",       "text": "left",       "iconPath": "assets/images/icons/arrow_left.png",       "selectedIconPath": "assets/images/icons/page_first.png"     },{       "pagePath": "pages/home/home",       "text": "right",       "iconPath": "assets/images/icons/arrow_right.png",       "selectedIconPath": "assets/images/icons/page_last.png"     }] 设置如上，对应路径都有相应的icon图片，但是tabBar不显示