js onkeypress与onkeydown 事件区别详细说明

onkeypress 和 onkeydown 是有区别,下面将讲解 onkeypress 与 onkeydown 事件的区别。
onkeypress 事件在用户按下并放开任何字母数字键时发生。但是系统按钮(例如:箭头键、功能键)无法得到识别。
onkeydown 事件在用户按下任何键盘键(包括系统按钮)时发生。
具体区别:
1. 一个放开一个没有放开,onkeydown 先于 onkeypress 发生。
2.onkeypress 无法系统按钮。
2.onkeydown 捕获的 keyCode 不区分字母大小,而 onkeypress 区分。

onkeypress是在用户按下并放开任何字母数字键时发生。系统按钮(例如,箭头键和功能键)无法得到识别。
onkeyup 是在用户放开任何先前按下的键盘键时发生。
onkeydown 是在用户按下任何键盘键(包括系统按钮,如箭头键和功能键)时发生。

onkeypress
As of Microsoft® Internet Explorer 4.0, the onkeypress event fires and can be canceled for the following keys: 

Letters: A - Z (uppercase and lowercase)
Numerals: 0 - 9
Symbols: ! @ # $ % ^ & * ( ) _ - + = < [ ] { } , . / ? \ | ' ` " ~
System: ESC, SPACEBAR, ENTER 

onkeydown
As of Microsoft® Internet Explorer 4.0, the onkeydown event fires for the following keys: 

Editing: DELETE, INSERT
Function: F1 - F12
Letters: A - Z (uppercase and lowercase)
Navigation: HOME, END, LEFT ARROW, RIGHT ARROW, UP ARROW, DOWN ARROW
Numerals: 0 - 9
Symbols: ! @ # $ % ^ & * ( ) _ - + = < [ ] { } , . / ? \ | ' ` " ~
System: ESC, SPACEBAR, SHIFT, TAB 

As of Internet Explorer 5, the event also fires for the following keys: 

Editing: BACKSPACE
Navigation: PAGE UP, PAGE DOWN
System: SHIFT+TAB 

As of Internet Explorer 5, this event can be canceled for the following keys and key combinations by specifying event.returnValue=false: 

Editing: BACKSPACE, DELETE
Letters: A - Z (uppercase and lowercase)
Navigation: PAGE UP, PAGE DOWN, END, HOME, LEFT ARROW, RIGHT ARROW, UP ARROW, DOWN ARROW
Numerals: 0 - 9
Symbols: ! @ # $ % ^ & * ( ) _ - + = < [ ] { } , . / ? \ | ' ` " ~
System: SPACEBAR, ESC, TAB, SHIFT+TAB 

You can cancel all keys that fire the onkeydown event in HTML Applications, including most accelerator keys, such as ALT+F4. 

In Internet Explorer 4.0, you cannot cancel the onkeydown event, but you can use the onkeypress event to cancel keyboard events.

两个一起按,可以这样:
代码如下:

if( window.event.shiftKey && event.keyCode==xx) 

function document_onpress()
{ 

if(event.keyCode=="13")
{
document.all.div_Line.style.pixelLeft=document.all.div_Line.style.pixelLeft+1;
document.all.div_Q.style.pixelLeft=document.all.div_Q.style.pixelLeft+1;
document.all.div_T.style.pixelLeft=document.all.div_T.style.pixelLeft+1;
}
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