1 说明：
 2 导航栏最少2项，最多5项
 3 color  文字的颜色
 4 selectedColor  选中后文字的颜色
 5 backgroundColor  导航栏背景色
 6 borderStyle  导航栏上边框颜色，只支持black和white
 7 pagePath  路径
 8 iconPath  图标路径
 9 selectedIconPath  选中时候的图标路径
10 text  名字
11 "tabBar": {
12     "color": "#7a7e83",
13     "selectedColor": "green",
14     "boarderStyle": "black",
15     "backgroundColor": "#fff",
16     "list": [{
17       "pagePath": "pages/index/index",
18       "text": "职位",
19       "iconPath": "images/job.png",
20       "selectedIconPath": "images/jobselected.png"
21     },
22     {
23       "pagePath": "pages/index/index",
24       "text": "排行榜",
25       "iconPath": "images/ranking.png",
26       "selectedIconPath": "images/rankselected.png"
27     },
28     {
29       "pagePath": "pages/index/index",
30       "text": "我的",
31       "iconPath": "images/my.png",
32       "selectedIconPath": "images/myselected.png"
33     }
34   ]
35   },