<script type="text/javascript" language=JavaScript charset="UTF-8">      document.onkeydown=function(event){            var e = event || window.event || arguments.callee.caller.arguments[0];            if(e && e.keyCode==27){ // 按 Esc                 //要做的事情              }            if(e && e.keyCode==113){ // 按 F2                  //要做的事情               }                         if(e && e.keyCode==13){ // enter 键                 //要做的事情            }        }; </script>只要你定义了这些键的动作，你在浏览器里按下这些键就会响应，兼容目前所有浏览器。

js 里面的键盘事件经常用到，所以收集了键盘事件对应的键码来分享下：keyCode 8 = BackSpace BackSpacekeyCode 9 = Tab TabkeyCode 12 = ClearkeyCode 13 = EnterkeyCode 16 = Shift_LkeyCode 17 = Control_LkeyCode 18 = Alt_LkeyCode 19 = PausekeyCode 20 = Caps_LockkeyCode 27 = Escape EscapekeyCode 32 = spacekeyCode 33 = PriorkeyCode 34 = NextkeyCode 35 = EndkeyCode 36 = HomekeyCode 37 = LeftkeyCode 38 = UpkeyCode 39 = RightkeyCode 40 = DownkeyCode 41 = SelectkeyCode 42 = PrintkeyCode 43 = ExecutekeyCode 45 = InsertkeyCode 46 = DeletekeyCode 47 = HelpkeyCode 48 = 0 equal bracerightkeyCode 49 = 1 exclam onesuperiorkeyCode 50 = 2 quotedbl twosuperiorkeyCode 51 = 3 section threesuperiorkeyCode 52 = 4 dollarkeyCode 53 = 5 percentkeyCode 54 = 6 ampersandkeyCode 55 = 7 slash braceleftkeyCode 56 = 8 parenleft bracketleftkeyCode 57 = 9 parenright bracketrightkeyCode 65 = a AkeyCode 66 = b BkeyCode 67 = c CkeyCode 68 = d DkeyCode 69 = e E EuroSignkeyCode 70 = f FkeyCode 71 = g GkeyCode 72 = h HkeyCode 73 = i IkeyCode 74 = j JkeyCode 75 = k KkeyCode 76 = l LkeyCode 77 = m M mukeyCode 78 = n NkeyCode 79 = o OkeyCode 80 = p PkeyCode 81 = q Q atkeyCode 82 = r RkeyCode 83 = s SkeyCode 84 = t TkeyCode 85 = u UkeyCode 86 = v VkeyCode 87 = w WkeyCode 88 = x XkeyCode 89 = y YkeyCode 90 = z ZkeyCode 96 = KP_0 KP_0keyCode 97 = KP_1 KP_1keyCode 98 = KP_2 KP_2keyCode 99 = KP_3 KP_3keyCode 100 = KP_4 KP_4keyCode 101 = KP_5 KP_5keyCode 102 = KP_6 KP_6keyCode 103 = KP_7 KP_7keyCode 104 = KP_8 KP_8keyCode 105 = KP_9 KP_9keyCode 106 = KP_Multiply KP_MultiplykeyCode 107 = KP_Add KP_AddkeyCode 108 = KP_Separator KP_SeparatorkeyCode 109 = KP_Subtract KP_SubtractkeyCode 110 = KP_Decimal KP_DecimalkeyCode 111 = KP_Divide KP_DividekeyCode 112 = F1keyCode 113 = F2keyCode 114 = F3keyCode 115 = F4keyCode 116 = F5keyCode 117 = F6keyCode 118 = F7keyCode 119 = F8keyCode 120 = F9keyCode 121 = F10keyCode 122 = F11keyCode 123 = F12keyCode 124 = F13keyCode 125 = F14keyCode 126 = F15keyCode 127 = F16keyCode 128 = F17keyCode 129 = F18keyCode 130 = F19keyCode 131 = F20keyCode 132 = F21keyCode 133 = F22keyCode 134 = F23keyCode 135 = F24keyCode 136 = Num_LockkeyCode 137 = Scroll_LockkeyCode 187 = acute gravekeyCode 188 = comma semicolonkeyCode 189 = minus underscorekeyCode 190 = period colonkeyCode 192 = numbersign apostrophekeyCode 210 = plusminus hyphen macronkeyCode 211 =keyCode 212 = copyright registeredkeyCode 213 = guillemotleft guillemotrightkeyCode 214 = masculine ordfemininekeyCode 215 = ae AEkeyCode 216 = cent yenkeyCode 217 = questiondown exclamdownkeyCode 218 = onequarter onehalf threequarterskeyCode 220 = less greater barkeyCode 221 = plus asterisk asciitildekeyCode 227 = multiply divisionkeyCode 228 = acircumflex AcircumflexkeyCode 229 = ecircumflex EcircumflexkeyCode 230 = icircumflex IcircumflexkeyCode 231 = ocircumflex OcircumflexkeyCode 232 = ucircumflex UcircumflexkeyCode 233 = ntilde NtildekeyCode 234 = yacute YacutekeyCode 235 = oslash OobliquekeyCode 236 = aring AringkeyCode 237 = ccedilla CcedillakeyCode 238 = thorn THORNkeyCode 239 = eth ETHkeyCode 240 = diaeresis cedilla currencykeyCode 241 = agrave Agrave atilde AtildekeyCode 242 = egrave EgravekeyCode 243 = igrave IgravekeyCode 244 = ograve Ograve otilde OtildekeyCode 245 = ugrave UgravekeyCode 246 = adiaeresis AdiaeresiskeyCode 247 = ediaeresis EdiaeresiskeyCode 248 = idiaeresis IdiaeresiskeyCode 249 = odiaeresis OdiaeresiskeyCode 250 = udiaeresis UdiaeresiskeyCode 251 = ssharp question backslashkeyCode 252 = asciicircum degreekeyCode 253 = 3 sterlingkeyCode 254 = Mode_switch使用event对象的keyCode属性判断输入的键值eg：if(event.keyCode==13)alert(“enter!”);键值对应表A　　0X65 　U 　　0X85B　　0X66　 V　　 0X86C　　0X67　 W　　 0X87D　　0X68　 X 　　0X88E　　0X69　 Y　　 0X89F　　0X70　 Z　　 0X90G　　0X71　 0　　 0X48H　　0X72　 1　　 0X49I　　0X73　 2　　 0X50J　　0X74　 3 　　0X51K　　0X75　 4 　　0X52L　　0X76　 5 　　0X53M　　0X77　 6　　 0X54N　　0X78 　7 　　0X55O　　0X79 　8 　　0X56P　　0X80 　9 　　0X57Q　　0X81　ESC　　0X1BR　　0X82　CTRL 　0X11S　　0X83　SHIFT　0X10T　　0X84　ENTER　0XD如果要使用组合键，则可以判断是否同时按下了这几个键，比如ctrl键、shift键以及alt键的组合使用就可以判断是否多按下了ctrl键、shift键以及alt键