JavaScript DOM Programming Art (2) syntax

1. Statements

Have each statement exclusive to a single line, with a semicolon at the end of each statement

2. Annotation method:

1, single-line comment \ \

2. Multiline comment/* */

3. Variables

Variables in JScript can be declared without being directly used such as: mood= "Happy";

Variable names and other element names are case sensitive

4. Data type (scalar)

Weak type

1. String

Single quotation mark, double quote escape character \

The use of quotation marks remains consistent throughout the script

2. Value

Integers, decimals, negative numbers

3. Boolean value

Boolean value is not a string, no quotation marks are used when assigning values

5. Arrays

var Lennon = Array (); Length starting from 0

An array element can be a string, a numeric value, a Boolean, a variable, an array

Associative arrays

　　

JavaScript DOM Programming Art (2) syntax