Q：Uncaught ReferenceError: CC_PHYSICS_BUILTIN is not defined
A：先clean build folder....，然后重新build
Q：xcode 使用模拟器预览 报错 In /Library/Developer/Xcode/DerivedData/hello_world-djnvsdcqyfoqvdepilidvunfunto/Build/Products/Debug-iphonesimulator/libcocos2d iOS.a(ftsystem.o), building for iOS Simulator, but linking in object file built for iOS, file '/Users/leiming/Library/Developer/Xcode/DerivedData/hello_world-djnvsdcqyfoqvdepilidvunfunto/Build/Products/Debug-iphonesimulator/libcocos2d iOS.a' for architecture arm64
A：解决办法，排除 ios 模拟器使用arm64的cpu
再次run 成功
