Electronics components from Shenzhen

Hello,
I've baught some common electronic components in Shenzhen (connectors,regulators,resistors,capacitors) in a bigger quantity than i was expecting (maybe about 10000 yuans,i'll check the exact amount),I have asked an invoice to each seller. Do I have to declare something to Chinese customs when I'll leave China?

Thank you for your help,
Fabien Weiss