JavaScript learning summary (suitable for novice reference)_javascript skills

Constant: JavaScript constant, also known as literal constant, is information solidified in the program code.

Variables: The main function of variables is to access data and provide a container for accessing information.

Data Type

Integer type: Integer constant is a number, which can be decimal, octal or hexadecimal.

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

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

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

Alert box pops up: alert

A dialog box pops up to confirm "Yes/No": confirm

Output to page content: document.write

Get the built-in object: dateobj=new Date();

               theYear=dateobj.getYear();

Common methods of javascript Date object

方法	说明
getDate（）	返回日期值（1-31）
getDay（）	返回星期值（0-6）
getHours（）	返回小时值（0-23）
getMinutes()	返回分钟值（0-59）
getSeconds()	返回秒值（0-59）
getMonth()	返回月份值（0-11）
getFullYear()	返回年份，值为4位数
getTime()	返回自（1970 01 01）以来的毫秒数

Method

Description

　getDate()

Return date value (1-31)

　getDay()

Returns the day of the week value (0-6)

　getHours()

Return the hour value (0-23)

　getMinutes()

Return the minute value (0-59)

　getSeconds()

Return the second value (0-59)

　getMonth()

Return the month value (0-11)

　getFullYear()

Returns the year, the value is 4 digits

　getTime()

Returns the number of milliseconds since (1970 01 01)