body's event

onload:

when page is loaded

onresize:

when browser is resized

style object

each element of web page has a style object

style.height:

style.width:

document object

document.body.clientHeigth:

client window height

document.body.clientWidth:

client window width

document.getElementById("elementName")

document.cookie:

set cookie:

ex:

document.cookie="name1=peter;expires=1/1/2000;";

how to clear cookie:

set it value to "" & expiration data to -1

string method

indexOf()

find the pattern in the string

ex:

"abcdef".indexof("bc");

getElementById

getElementById

get html element 

ex:

html element:

input type="text", id="test",  name="abc"

javascript:

document.getElementById("test").value

access data from value

math methods

NaN:

not a number

parseInt():

convert test to integer

ex:

parseInt("1");

parseFloat()

isNaN():

ex:

var a=3;

isNaN(a);

toFixed():

ex:

a=3.333;

a.toFixed(2);

---> a=3.33

alert

show an alert box:

ex:

alert("hello");