底部菜单tabbar实现

{
  "pages": [
    "pages/index/index",
    "pages/category/index",
    "pages/cart/index",
    "pages/my/index"
  ],
  "window": {
    "navigationBarTextStyle": "black",
    "navigationBarTitleText": "Java1234商城",
    "navigationBarBackgroundColor": "#ffffff"
  },
  "tabBar": {
      "color": "#999",
      "selectedColor": "#FF5700",
      "backgroundColor": "#fafafa",
      "list": [{
          "pagePath": "pages/index/index",
          "text": "首页",
          "iconPath": "icons/_home.png",
          "selectedIconPath": "icons/home.png"
      },
      {
        "pagePath": "pages/category/index",
        "text": "分类",
        "iconPath": "icons/_category.png",
        "selectedIconPath": "icons/category.png"
    },
    {
        "pagePath": "pages/cart/index",
        "text": "购物车",
        "iconPath": "icons/_cart.png",
        "selectedIconPath": "icons/cart.png"
    },
    {
        "pagePath": "pages/my/index",
        "text": "我的",
        "iconPath": "icons/_my.png",
        "selectedIconPath": "icons/my.png"
    }]
  },
  "style": "v2",
  "componentFramework": "glass-easel",
  "sitemapLocation": "sitemap.json",
  "lazyCodeLoading": "requiredComponents"
}