JavaScript Learning Summary (for novice reference) _javascript tips

constants: JavaScript constants, also called Literal constants, are the information that is solidified in program code.

variables: The main function of a variable is to access data, providing a container for accessing information.

Data type

Integral type: integer constant is a number, can be decimal, octal, hexadecimal.

String: A string is one or more characters enclosed in English "or".

Boolean: Boolean constants are logical "true" and "false".

Null value: In JavaScript, "null" means nothing.

pop-up alert box:alert

Pop-up Confirmation "Yes/No" dialog box:confirm

output to page content:document.write

get built-in objects: dateobj=new Date ();

theyear= dateobj . GetYear ();

Common methods for JavaScript Date objects

Method	Description
GetDate ()	Return date value (1-31)
Getday ()	Return week value (0-6)
GetHours ()	Return hour value (0-23)
Getminutes ()	Return minutes value (0-59)
Getseconds ()	Return second value (0-59)
GetMonth ()	Return month value (0-11)
getFullYear ()	Returns the year with a value of 4 digits
GetTime ()	Returns the number of milliseconds since (1970 01 01)