配置如下：

    {
"pages": [
    "pages/index/index",
    "pages/mine/mine"
],
"window": {
    "backgroundTextStyle": "light",
    "navigationBarBackgroundColor": "#fff",
    "navigationBarTitleText": "活动宝",
    "navigationBarTextStyle": "black"
},
"tabBar": {
    "backgroundColor": "#202020",
    "color": "#fff",
    "list": [
        {
            "selectedIconPath": "images/ic_index2.png",
            "iconPath": "images/ic_index1.png",
            "text": "首页",
            "backgroundColor": "#dddddd",
            "pagePath":"page/index/index"
        },
        {
            "selectedIconPath": "images/ic_mine2.png",
            "iconPath": "images/ic_mine1.png",
            "text": "我的",
            "backgroundColor": "#dddddd",
            "pagePath": "page/mine/mine"
        }
    ]
}
}

效果图出不来的原因在于： 
pagePath节点配置错误，但工具又没有报错。正确的应该为：

"pagePath": "pages/mine/mine"