解决微信小程序tabBar不显示

第一情况，设置了csutom:true,该参数是启动自定义tarBar的意思，启动以后，就不会再去识别app.json里的tarBar配置

//解决办法：设置custom:false，就可以了
 "tabBar": {
    "custom": false,//关闭自定义tarBar
  }

第二种情况，tarBar属性中设置的pagePath地址，需要在pages参数中置顶默认首页显示。如下

"pages": [
    "pages/index/index",//默认首页
    "pages/successPage/successPage",
    "pages/logs/logs"
  ],
  "tabBar": {
    "list": [
      {
        "pagePath": "pages/index/index", //默认首页
        "text": "首页",
        "iconPath": "/images/tabs/home.png",
        "selectedIconPath": "/images/tabs/home-active.png"
      },
      {
        "pagePath": "pages/successPage/successPage",
        "text": "授权",
        "iconPath": "/images/tabs/my.png",
        "selectedIconPath": "/images/tabs/my-active.png"
      }
    ]
  },