uniapp分包，真机预览报错message：Error: 系统

小程序有体积和资源加载限制。在微信小程序中，每个包不能超过2M,总计不能超过20M。
使用分包https://developers.weixin.qq.com/miniprogram/dev/framework/subpackages/basic.html

{
  "pages":[
    "pages/index",
    "pages/logs"
  ],
  "subpackages": [
    {
      "root": "packageA",
      "pages": [
        "pages/cat",
        "pages/dog"
      ]
    }, {
      "root": "packageB",
      "name": "pack2",
      "pages": [
        "pages/apple",
        "pages/banana"
      ]
    }
  ]
}

{
    "pages": [
        // pages数组中第一项表示应用启动页，参考：https://uniapp.dcloud.io/collocation/pages
        {
            "path": "pages/index/index",
            "style": {
                "navigationBarTitleText": "企业端",
                "navigationBarBackgroundColor":"#007AFF",
                "app-plus": {
                    "bounce": "vertical",
                    "titleNView": {
                        "buttons": [{
                            "fontSize": "22px",
                            "color": "#000000"
                        }]
                    }
                }
            }
        },
        
    ],
    "subPackages": [
            {
                "root": "JobFairs",
                "pages": [
                    {
                        "path": "jobViewPosition",
                        "style": {
                            "navigationBarTitleText": "查看职位",
                            "navigationBarBackgroundColor":"#007AFF",
                            "navigationStyle":"custom",
                            "app-plus": {
                                "titleNView": {
                                    "buttons": [{
                                        "fontSize": "32px",
                                        "color": "#000000"
                                    }]
                                }
                            }
                        }
                    },
            },
            {
                "root": "self",
                "pages": [
                    {
                        "path" : "Delivery",
                        "style": {
                            "navigationBarTitleText": "投递记录",
                            "navigationBarBackgroundColor":"#007AFF",
                            "app-plus": {
                                "titleNView": {
                                    "buttons": [{
                                        "fontSize": "32px",
                                        "color": "#000000"
                                    }]
                                }
                            }
                        }
                    },
            }
        ],
    "globalStyle": {
        "pageOrientation": "portrait",
        "navigationBarTitleText": "Hello uniapp",
        "navigationBarTextStyle": "black",
        "navigationBarBackgroundColor": "#ffffff",
        "backgroundColor": "#F8F8F8",
        "backgroundColorTop": "#F4F5F6",
        "backgroundColorBottom": "#F4F5F6",
        "mp-360": {
            "navigationStyle": "custom"
        },
        "h5": {
            "maxWidth": 1190,
            "navigationBarTextStyle": "black",
            "navigationBarBackgroundColor": "#F1F1F1"
        }
    },
    "tabBar": {
        "color": "#7A7E83",
        "selectedColor": "#007AFF",
        "borderStyle": "black",
        "backgroundColor": "#ffffff",
        "fontSize":"16px",
        "list":[
            {
                "pagePath": "pages/index/index",
                "text": "首页"
            },
            {
                "pagePath": "pages/notify/notify",
                "text": "通知通告"
            },
            {
                "pagePath": "pages/policy/policy",
                "text": "政策"
            }, 
            {
                "pagePath": "pages/JobFairs/JobFairs",
                "text": "招聘会"
            },
            {
                "pagePath": "pages/self/self",
                "text": "我的"
            }
        ]
    },
    "condition" : { //模式配置，仅开发期间生效
        "current": 0, //当前激活的模式(list 的索引项)
        "list": [
            {
                "name": "", //模式名称
                "path": "", //启动页面，必选
                "query": "" //启动参数，在页面的onLoad函数里面得到
            }
        ]
    }
}