小程序学习：tabBar

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tabBar需要设置 app.json ，大小写敏感，例如 pagePath 写成 pagepath，则提示出错。

以下为app.json 内容：

{
  "pages": [
    "pages/index/index",
    "pages/logs/logs",
    "pages/newpage/newpage"
  ],
  "window": {
    "backgroundTextStyle": "light",
    "navigationBarBackgroundColor": "#ffcc00",
    "navigationBarTitleText": "玄铁重剑",
    "navigationBarTextStyle": "black"
  },
  "tabBar": {
    "backgroundcolor": "#000",
    "list": [
      {
        "pagePath": "pages/index/index",
        "text": "您好"
      },
      {
        "pagePath": "pages/logs/logs",
        "text": "郭靖"
      },
      {
        "pagePath": "pages/newpage/newpage",
        "text": "杨过"
      }
    ]
  }
}