JavaScript Basic Knowledge Collation

JS Comment Syntax:

Single-line Comment://The later content will be commented

Multiline Comment:/* Intermediate content is commented */

Output syntax: alert (); Output content confirm (); Output selectable content prompt (); Output and accept user input

Embed JS code: Theoretically, any location on the page can be embedded but generally we want to embed the JS code in the lowest part of the page

Inline <script type= "Text/javascript" ></script>

External <script type= "file Address" ></script>

Basic knowledge of the program:

1) All characters Embox is English half angle

2) In most cases, add a semicolon after each statement ends

3) Add a newline after each code ends

4) Pre-and post-process echoes

Strongly typed syntax: A data type must be defined on transfer

Weakly typed syntax: No data types are defined and can be converted automatically

Basic data type: integer: int single precision decimal: float double decimal: Double decimal: Decimal Currency: Money

Character: Char string: String Boolean: BOOL (True True False) DateTime type Datetame

Variable:

All variable definitions are defined with VAR

Type conversions:

Other types are converted to integers: parseint ();

Other types convert to decimals: parsefloat ();

Operator:

Math operators: +-*/% + Good to do string stitching

Relational operators: = =! = > >= < <=

Logical operator:&& | | !

Other operators: + = = *=/=%=?: (condition?) satisfies the condition "OK": The condition "no" is not satisfied)

JavaScript Basic Knowledge Collation