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在 app.json 文件里面：

{
"pages":[
"pages/index/index",
"pages/logs/logs",
"pages/topic/topic",
"pages/category/category"
],
"window":{
"backgroundTextStyle":"light",
"navigationBarBackgroundColor": "#000",
"navigationBarTitleText": "大熊图书馆",
"navigationBarTextStyle":"white"
},
"tabBar": {
"color": "#8c8c8c",//字体颜色
"selectedColor": "#f4645f", //选中字体颜色
"backgroundColor": "#fff",//背景颜色
"list": [{
"pagePath": "pages/index/index",
"text": "图书",
"iconPath":"images/book.png",
"selectedIconPath":"images/book1.png"
},
{
"pagePath": "pages/category/category",
"text": "评论",
"iconPath":"images/book.png",
"selectedIconPath":"images/book1.png"
},
{
"pagePath": "pages/topic/topic",
"text": "我的",
"iconPath":"images/book.png",
"selectedIconPath":"images/book1.png"
}
],
"position": "bottom" //写成 top 就在上面
}
}