JS之onkeypress,onkeydown,onkeyup区别

 

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&reg; 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&reg; 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： 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; }