1. The number of sub-tree comprising a node of the node is referred to as
Data types 2.JavaScript Category:
The first classification model, which is the more common method of classification, divided into nine types: namely, Undefined, Boolean, Object, Number, Null, String, Reference, List, Completion, which Reference, List, Completion three types use only common language runtime parsing can not be accessed directly from the program
The second classification methods: using typeof () keyword classification, can be divided into: undefined, number, string, boolean, object, function.
3. The main reason for using the derived class (to improve reusability of code).
4.10BASET Ethernet physical topology of the star type (the logical topology of bus).
5.