Jquery $ application note (continuously updated)

Javascript	Jquery
Register an event
<Asp: button id = "button" text ="Button"Runat =" server" Onclientclick = "javascript: clickevent ();"/>	$ ("# <% = Button. clientid %> ").Click(Isclick ); $ ("# <% = Button. clientid %> ").Blur(Isblur ); Or $ ("# <% = Button. clientid %> ").Blur(Function (){ Isblur (); });
Get controlID
Document. getelementbyid ('trremark ')	$ ("# Trremark ")
Get server controlsID
Document. getelementbyid ('<% = button. clientid %> ')	$ ("# <% = Button. clientid %> ")
display and hide htmlelements
document. getelementbyid ("TR "). style ("display", "inline"); document. getelementbyid ("TR "). style ("display", "NONE");	$ (" # TR "). show (); $ (" # TR "). hide (); $ (" # TR "). toggle ();
Get value\Text
Document. getelementbyid ("TXT"). Value Document. getelementbyid ("TXT"). innertext	$ ("# <% = TXT. clientid %>"). Val () $ ("# <% = TXT. clientid %>"). Text () $ ("# <% = Dropdownlist. clientid %> Option: Selected"). Text ()
Array
var arr = new array (); arr [0] =" "; arr [1] = B; arr [2] =" C ";	var arr = [" A ", B," C "];
JudgmentArrayIs thereFalse
For(VAR I =0; I <entryarray. length; I ++ ){ If (entryarray [I] == false ) { Flag =False; Break; } } If(Flag =False){ // Todo }	If ($. inarray ("false", entryarray )! =-1 ){ // Todo }
Determine whether the object isUndefined
Typeof (document. getelementbyid ('trremark '))! = "Undefined"	Typeof trremark! = 'Undefined'
Load Style
	$ ("# <% = Button. clientid %>" ).css ("bordercolor", "Red ");
Assign values to elements
Document. getelementbyid ("textbox"). value = "1234 ";	$ ("# Textbox"). Val ("1234 ");
Indexof
JSInclusion relationship UseIndexof ()Method If> = 0Otherwise, it does not contain VaR A = "testhelloword "; Document. Write (A. indexof ("hello "));	$ ("# Textbox"). Val (). indexof ("Hello") <0

It is found that the add () of the encapsulated element set is good.
Solve one of my earlier questions:
$ ("# <% = Button1.clientid %>"). Click (clickevent );
$ ("# <% = Button2.clientid %>"). Click (clickevent );
$ ("# <% = Button3.clientid %>"). Click (clickevent );
The events of the above three buttons are the same.
I don't write it like this every time. How can we simplify it?
Use add ()
$ ("# <% = Button1.clientid %> ")
. Add ("# <% = button2.clientid %> ")
. Add ("# <% = button3.clientid %> ")
. Click (clickevent );