(1)-syntax structure

The learning of each language usually starts with the syntax structure!

1. JavaScript uses the unicode character set, which is a common language in the world;

Ii. case sensitive, but html is not case sensitive;

3. Although line breaks are allowed, it is necessary to add a semicolon to each ending statement to maintain good coding habits;

Iv. identifier: used to name variables and functions

1. The first character must contain letters, underscores (_), and dollar signs ($)
2. Not only reserved keywords

By: dxh_0829