Second, JavaScript syntax

1.1 Case-sensitive

JavaScript Everything is case-sensitive.

1.2 Identifiers

Identifier concept: refers to the name of a variable, function, property, or parameter of a function.

• Characters can be letters, underscores, dollar signs, or numbers.
• The first character cannot be a number.

JavaScript is typically camel-named: MyCar, Dosomethingimportant

1.3 Notes

Single-line comment//

Block-level comments/* *

1.4 Strict Mode

"Use strict";

You can no longer declare global variables in a function without using Var;

1.5 statements

Statement to divide well (;) end

Code blocks using curly braces

Second, JavaScript syntax