以这套教材为例。每一步的源代码都托管在我的Github仓库中。每次上传前，请确保本地测试通过。但是，笔者在编写过程中发现，之前测试通过的代码，可能在几个月后执行，会遇到白屏，即应用无法正常加载，或者无法正常加载调试模式。举一个具体的例子。本文写于2022年11月20日，进入第6步，运行命令行ui5serve：使用这个url，可以正常打开SAPUI5应用：使用快捷键Ctrl+Shift+Alt+P切换到debugmode，然后使用如下url，无法打开应用程序：http://localhost:8080/webapp/index.html?sap-ui-debug=true错误信息：ui5loader-dbg.js:1283AccesstoXMLHttpRequestat来自来源“http://localhost:8080”的“https://sapui5.hana.ondemand....”已被CORS策略阻止：请求的资源上不存在“Access-Control-Allow-Origin”标头.loadSyncXHR@ui5loader-dbg.js:1283requireModule@ui5loader-dbg.js:1538requireAll@ui5loader-dbg.js:1730executeModuleDefinition@ui5loader-dbg.js:1796ui5Define@ui5loader-dbg.js:1929eval@Core-dbg.js?eval:8execModule@ui5loader-dbg.js:1645requireModule@ui5loader-dbg.js:1546requireSync@ui5loader-dbg.js:2056(匿名)@sap-ui-core-dbg.js?bundle-code-0:1ui5loader-dbg。js:1283GEThttps://sapui5.hana.ondemand....net::ERR_FAILED404loadSyncXHR@ui5loader-dbg.js:1283requireModule@ui5loader-dbg.js:1538requireAll@ui5loader-dbg.js:1730executeModuleDefinition@ui5loader-dbg.js:1796ui5Define@ui5loader-dbg.js:1929eval@Core-dbg.js?eval:8execModule@ui5loader-dbg.js:1645requireModule@ui5loader-dbg.js:1546requireSync@ui5dbg.js:2056(anonymous)@sap-ui-core-dbg.js?bundle-code-0:1ui5loader-dbg.js:1283在'https://sapui5.hana.ondemand....'来自来源'http://localhost:8080'已被CORS策略阻止：请求的资源上不存在'Access-Control-Allow-Origin'标头。loadSyncXHR@ui5loader-dbg.js:1283requireModule@ui5loader-dbg.js:1538requireAll@ui5loader-dbg.js:1730executeModuleDefinition@ui5loader-dbg.js:1796ui5Define@ui5loader-dbg.js:1929eval@Core-dbg.js?eval:8execModule@ui5loader-dbg.js:1645dbrequireModule@gui5loader-.js:1546requireSync@ui5loader-dbg.js:2056（匿名）@sap-ui-core-dbg.js?bundle-code-0:1ui5loader-dbg.js:1283GEThttps://sapui5.hana.ondemand。...净::ERR_FAILED404loadSyncXHR@ui5loader-dbg.js:1283requireModule@ui5loader-dbg.js:1538requireAll@ui5loader-dbg.js:1730executeModuleDefinition@ui5loader-dbg.js:1796ui5Define@ui5loader-dbg.js:1929eval@Core-dbg.js?eval:8execModule@ui5loader-dbg.js:1645requireModule@ui5loader-dbg.js:1546requireSync@ui5loader-dbg.js:2056(匿名)@sap-ui-core-dbg.js?bundle-code-0:1ui5loader-dbg.js:1042UncaughtModuleError:无法解决'sap/ui/core/Core.js'->'sap/ui/core/ThemeCheck.js'的依赖关系：无法从加载'sap/ui/core/ThemeCheck.js'https://sapui5.hana.ondemand....无法在“XMLHttpRequest”上执行“发送”：无法加载“https://sapui5.hana.ondemand....”。在makeModuleError(https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1044:15)在Module.failWith(https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:816:13)在https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1860:32atrequireAll(https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1745:5)在executeModuleDefinition(https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1798:3)atObject.ui5Define[asdefine](https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1931:3)ateval(https://sapui5.hana.ondemand.com/resources/sap/ui/core/Core-dbg.js?eval:8:8)ateval(
