JS Third Class

Javascript (iii)

1. Functions

function functionname (arg1,arg2 ...)

{

.....

}

Return statement usage

2. Objects

Properties/Methods

var avalues=new Array ();

var mystring=new String ("Hello World");

3. Date Object (var mydate=new date ())

1) Calculate program execution speed (get milliseconds) 1.html

2) method

Method	Describe
getFullYear ()	Returns a four-digit year
GetMonth ()	Returns the month (current month-1)
GetDate ()	Return date (starting from 1)
GetDay ()	Return day of the week (Sunday 0)
GetHours ()	Returns the number of hours (starting from 1)
Getminutes ()	Returns the number of minutes (starting from 1)
Getseconds ()	Returns the number of seconds (starting at 1)
Getmilliseconds ()	Returns the number of milliseconds (starting at 0)
GetTime ()	Returns the number of milliseconds elapsed from GMT time January 1, 1970 0:0 0 seconds

Get current time: 2.html

Get difference days: 3.html

4. Math Object

1) Properties

Math.ln10	Natural logarithm of 10
Math.ln2	Natural logarithm of 2
math.log2e	Logarithm of base E of 2
math.log10e	Logarithm of base E of 10
Math.PI	Pi
Math.sqrt1_2	Square root of 1/2
Math.sqrt2	Square root of 2

2) method

Maximum value: Math.max (18,12,22,33)

Minimum value: Math.min (18,2,2,3,1)

Round up: Math.ceil (25.9)//It rounds the number up to the nearest integer

Rounding Down: Math.floor (25.6)

Rounding: Math.Round (25.6)

Random number between 0~1: Math.random ()//excluding 0 and 1

var Inum=math.floor (Math.random () *100+1)//Returns an integer between 1~100 including 1 and 100

Other methods

5. Window Object

1) window.open ("http://www.baidu.com", "_blank", "height=300,width=400,top=30,left=140,resizable=yes");

Resizable Whether you can resize a new window by dragging the default is Yes

Scrollable whether the new window shows scroll bars default to No

2) Close the new window

Window.close ()

3) alert (), confirm (), prompt ()

Confirm ("OK delete?") ")//Return Boolean type

4) Window.history.go (-1)//browser back one page

Window.history.go//forward one page

You can also use:

Window.history.back ()

Window.history.forward ()

JS Third Class