回帖：看了下changes files
Qt5.12.6
- Fix loading of EcmaScript modules when using the Qt Quick Compiler.
- Fix parsing errors when using a semicolon after an object literal in property bindings.
- Fix crash with null value type objects.
- The JavaScript engine will parse lists iteratively now, using less stack space. This allows for more complex JavaScript to be parsed.
Qt5.13.2
- EcmaScript modules are loaded correctly now when using theQt Quick Compiler.
- Various JavaScript list-like constructs are parsediteratively rather than recursively now, avoiding stack overflows.
- Exceptions thrown from a promise's resolve or rejecthandler are forwarded correctly now.
- MakeDay() and getDay() now behave more correctly.
估计是修复bug的时候引发了新的问题。。。