在uniapp项目中的根目录下找到pages.json文件夹：

{"pages": [ {"path": "pages/index/index","style": {"navigationBarTitleText": "index"}}],// 分包"subPackages": [{"root": "mail","pages": [{"path": "mail","style": {"navigationBarTitleText": "信箱"}}]} //最终地址： 根目录/mail/mail],"globalStyle": {"navigationBarTextStyle": "black","navigationBarTitleText": "11111","navigationBarBackgroundColor": "#F8F8F8","backgroundColor": "#F8F8F8"},"uniIdRouter": {}
}

分包预加载：

{// 分包预载配置"preloadRule": {// 当我们进入了pages/index/index页面以后就会预下载pages/subPack分包"pages/index/index": {"network": "all",	//在指定网络下预下载，可选值为：all（不限网络）、wifi（仅wifi下预下载）"packages": ["pages/subPack"]	//进入页面后预下载分包}}
}