JS scripting language (full name Java script: scripting language used in Web pages: very powerful language): basic syntax

One. Comment syntax

1. Single-line comment//

2. Multi-line Comment/**/

Two. Syntax output

1.alert (Info): Popup information

2.confirm (info): Pop Up a dialog box with user interaction

3.prompt (info): POPs up a dialog box for the user to enter

Three. Embed code

1. Write down as much as possible

2.<script style= "Textjavasprit" ></script>

Four. Basic knowledge of the program

1. All characters are in English half-width

2. In most cases, a semicolon is added after the end of each statement

3. Line breaks after each piece of code ends

4. Pre-and post-process echoes (preceded by a parenthesis "(must have a parenthesis end)")

Five. Data type

1. The data is stored in the program, and the stored name is called a variable

2. Data storage needs to exist in the corresponding data type variables: strongly typed language

3. The data is stored in a non-differentiated type (type auto-conversion): Weakly typed language

5. Type: (integer) int, (single-precision decimal float), (decimal number Double), (decimal: decimal), (currency type money), (character char), (string literal), (Boolean bool:true true). False), (date Time type datetime)

6. Variable definition: var:a=10; (if a variable with a decimal or an integer is defined, the value after the equal sign is written directly) (if you define a string variable, the value after the equals sign needs to be double or single quotation marks)

7. Type conversion: parseint

8. Operator Expressions:

JS scripting language (full name Java script: scripting language used in Web pages: very powerful language): basic syntax