Vue Advanced Series (a) principle and implementation of responsive

Vue Advanced Series (a) of the responsive principle and implementation: https://juejin.im/post/5bce6a26e51d4579e9711f1d

Vue Advanced Series (b) of the plug-in principle and implementation: https://juejin.im/post/5bd8fa04e51d45168b64f936

Render principle and implementation function Vue Advanced Series (three) of: https://juejin.im/post/5be2f0ae6fb9a049fa0f3dd2