以前编写好能够正常运行的 SAP UI5 代码，几个月后忽然不能运行了该怎么办？-Toy模板网

这篇具有很好参考价值的文章主要介绍了以前编写好能够正常运行的 SAP UI5 代码，几个月后忽然不能运行了该怎么办？。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

以笔者本套教材为例，每一步骤的源代码都托管在本人 Github 仓库里，每次上传之前，都确保本地测试通过。

但笔者编写过程中发现，之前测试通过的代码，可能几个月之后再执行，就会遇到白屏现象，即应用无法正常加载，或者无法在调试模式下正常加载。

举个具体的例子。本文写作于 2022年11月20日，进入步骤 6，运行命令行 ui5 serve:

使用这个 url，可以正常打开 SAP UI5 应用：

以前编写好能够正常运行的 SAP UI5 代码，几个月后忽然不能运行了该怎么办？

使用快捷键 Ctrl+Shift+Alt+P 切换到调试模式，然后根据如下 url，居然无法打开应用了：

http://localhost:8080/webapp/index.html?sap-ui-debug=true

以前编写好能够正常运行的 SAP UI5 代码，几个月后忽然不能运行了该怎么办？

错误消息：

ui5loader-dbg.js:1283 Access to XMLHttpRequest at ‘https://sapui5.hana.ondemand.com/resources/sap/ui/core/ThemeCheck-dbg.js’ from origin ‘http://localhost:8080’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
loadSyncXHR @ ui5loader-dbg.js:1283
requireModule @ ui5loader-dbg.js:1538
requireAll @ ui5loader-dbg.js:1730
executeModuleDefinition @ ui5loader-dbg.js:1796
ui5Define @ ui5loader-dbg.js:1929
eval @ Core-dbg.js?eval:8
execModule @ ui5loader-dbg.js:1645
requireModule @ ui5loader-dbg.js:1546
requireSync @ ui5loader-dbg.js:2056
(anonymous) @ sap-ui-core-dbg.js?bundle-code-0:1
ui5loader-dbg.js:1283 GET https://sapui5.hana.ondemand.com/resources/sap/ui/core/ThemeCheck-dbg.js net::ERR_FAILED 404
loadSyncXHR @ ui5loader-dbg.js:1283
requireModule @ ui5loader-dbg.js:1538
requireAll @ ui5loader-dbg.js:1730
executeModuleDefinition @ ui5loader-dbg.js:1796
ui5Define @ ui5loader-dbg.js:1929
eval @ Core-dbg.js?eval:8
execModule @ ui5loader-dbg.js:1645
requireModule @ ui5loader-dbg.js:1546
requireSync @ ui5loader-dbg.js:2056
(anonymous) @ sap-ui-core-dbg.js?bundle-code-0:1
ui5loader-dbg.js:1283 Access to XMLHttpRequest at ‘https://sapui5.hana.ondemand.com/resources/sap/ui/core/ThemeCheck.js’ from origin ‘http://localhost:8080’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
loadSyncXHR @ ui5loader-dbg.js:1283
requireModule @ ui5loader-dbg.js:1538
requireAll @ ui5loader-dbg.js:1730
executeModuleDefinition @ ui5loader-dbg.js:1796
ui5Define @ ui5loader-dbg.js:1929
eval @ Core-dbg.js?eval:8
execModule @ ui5loader-dbg.js:1645
requireModule @ ui5loader-dbg.js:1546
requireSync @ ui5loader-dbg.js:2056
(anonymous) @ sap-ui-core-dbg.js?bundle-code-0:1
ui5loader-dbg.js:1283 GET https://sapui5.hana.ondemand.com/resources/sap/ui/core/ThemeCheck.js net::ERR_FAILED 404
loadSyncXHR @ ui5loader-dbg.js:1283
requireModule @ ui5loader-dbg.js:1538
requireAll @ ui5loader-dbg.js:1730
executeModuleDefinition @ ui5loader-dbg.js:1796
ui5Define @ ui5loader-dbg.js:1929
eval @ Core-dbg.js?eval:8
execModule @ ui5loader-dbg.js:1645
requireModule @ ui5loader-dbg.js:1546
requireSync @ ui5loader-dbg.js:2056
(anonymous) @ sap-ui-core-dbg.js?bundle-code-0:1
ui5loader-dbg.js:1042 Uncaught ModuleError: Failed to resolve dependencies of ‘sap/ui/core/Core.js’
-> ‘sap/ui/core/ThemeCheck.js’: failed to load ‘sap/ui/core/ThemeCheck.js’ from https://sapui5.hana.ondemand.com/resources/sap/ui/core/ThemeCheck.js: Failed to execute ‘send’ on ‘XMLHttpRequest’: Failed to load ‘https://sapui5.hana.ondemand.com/resources/sap/ui/core/ThemeCheck.js’.
at makeModuleError (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1044:15)
at Module.failWith (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:816:13)
at https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1860:32
at requireAll (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1745:5)
at executeModuleDefinition (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1798:3)
at Object.ui5Define [as define] (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1931:3)
at eval (https://sapui5.hana.ondemand.com/resources/sap/ui/core/Core-dbg.js?eval:8:8)
at eval ()
at execModule (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1647:15)
at requireModule (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1548:5)
Caused by: ModuleError: failed to load ‘sap/ui/core/ThemeCheck.js’ from https://sapui5.hana.ondemand.com/resources/sap/ui/core/ThemeCheck.js: Failed to execute ‘send’ on ‘XMLHttpRequest’: Failed to load ‘https://sapui5.hana.ondemand.com/resources/sap/ui/core/ThemeCheck.js’.
at makeModuleError (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1044:15)
at Module.failWith (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:816:13)
at requireModule (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1545:13)
at requireAll (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1732:20)
at executeModuleDefinition (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1798:3)
at Object.ui5Define [as define] (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1931:3)
at eval (https://sapui5.hana.ondemand.com/resources/sap/ui/core/Core-dbg.js?eval:8:8)
at eval ()
at execModule (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1647:15)
at requireModule (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1548:5)
Caused by: Error: Failed to execute ‘send’ on ‘XMLHttpRequest’: Failed to load ‘https://sapui5.hana.ondemand.com/resources/sap/ui/core/ThemeCheck.js’.
at loadSyncXHR (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1285:8)
at requireModule (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1540:5)
at requireAll (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1732:20)
at executeModuleDefinition (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1798:3)
at Object.ui5Define [as define] (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1931:3)
at eval (https://sapui5.hana.ondemand.com/resources/sap/ui/core/Core-dbg.js?eval:8:8)
at eval ()
at execModule (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1647:15)
at requireModule (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:1548:5)
at Object.requireSync (https://sapui5.hana.ondemand.com/resources/sap-ui-core-dbg.js:2058:23)