app.json如下，但是我将custom值改为false又可以了（官方的是true，放项目里就不行），这是为什么？ {   "pages": [     "pages/index/index",     "pages/personal/personal"   ],   "tabBar": {     "custom": true,     "color": "#7A7E83",     "selectedColor": "#3cc51f",     "borderStyle": "black",     "backgroundColor": "#ffffff",     "list": [       {         "pagePath": "pages/index/index",         "iconPath": "image/icon_component.png",         "selectedIconPath": "image/icon_component_HL.png",         "text": "组件"       },       {         "pagePath": "pages/personal/personal",         "iconPath": "image/icon_API.png",         "selectedIconPath": "image/icon_API_HL.png",         "text": "我的"       }     ]   },   "window": {     "backgroundTextStyle":"light",     "navigationBarBackgroundColor": "#fff",     "navigationBarTitleText": "WeChat",     "navigationBarTextStyle":"black"   },   "style": "v2",   "componentFramework": "glass-easel",   "sitemapLocation": "sitemap.json",   "lazyCodeLoading": "requiredComponents" }