js中获取键盘事件

 <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 BackSpace
 keyCode 9 = Tab Tab
 keyCode 12 = Clear
 keyCode 13 = Enter
 keyCode 16 = Shift_L
 keyCode 17 = Control_L
 keyCode 18 = Alt_L
 keyCode 19 = Pause
 keyCode 20 = Caps_Lock
 keyCode 27 = Escape Escape
 keyCode 32 = space
 keyCode 33 = Prior
 keyCode 34 = Next
 keyCode 35 = End
 keyCode 36 = Home
 keyCode 37 = Left
 keyCode 38 = Up
 keyCode 39 = Right
 keyCode 40 = Down
 keyCode 41 = Select
 keyCode 42 = Print
 keyCode 43 = Execute
 keyCode 45 = Insert
 keyCode 46 = Delete
 keyCode 47 = Help
 keyCode 48 = 0 equal braceright
 keyCode 49 = 1 exclam onesuperior
 keyCode 50 = 2 quotedbl twosuperior
 keyCode 51 = 3 section threesuperior
 keyCode 52 = 4 dollar
 keyCode 53 = 5 percent
 keyCode 54 = 6 ampersand
 keyCode 55 = 7 slash braceleft
 keyCode 56 = 8 parenleft bracketleft
 keyCode 57 = 9 parenright bracketright
 keyCode 65 = a A
 keyCode 66 = b B
 keyCode 67 = c C
 keyCode 68 = d D
 keyCode 69 = e E EuroSign
 keyCode 70 = f F
 keyCode 71 = g G
 keyCode 72 = h H
 keyCode 73 = i I
 keyCode 74 = j J
 keyCode 75 = k K
 keyCode 76 = l L
 keyCode 77 = m M mu
 keyCode 78 = n N
 keyCode 79 = o O
 keyCode 80 = p P
 keyCode 81 = q Q at
 keyCode 82 = r R
 keyCode 83 = s S
 keyCode 84 = t T
 keyCode 85 = u U
 keyCode 86 = v V
 keyCode 87 = w W
 keyCode 88 = x X
 keyCode 89 = y Y
 keyCode 90 = z Z
 keyCode 96 = KP_0 KP_0
 keyCode 97 = KP_1 KP_1
 keyCode 98 = KP_2 KP_2
 keyCode 99 = KP_3 KP_3
 keyCode 100 = KP_4 KP_4
 keyCode 101 = KP_5 KP_5
 keyCode 102 = KP_6 KP_6
 keyCode 103 = KP_7 KP_7
 keyCode 104 = KP_8 KP_8
 keyCode 105 = KP_9 KP_9
 keyCode 106 = KP_Multiply KP_Multiply
 keyCode 107 = KP_Add KP_Add
 keyCode 108 = KP_Separator KP_Separator
 keyCode 109 = KP_Subtract KP_Subtract
 keyCode 110 = KP_Decimal KP_Decimal
 keyCode 111 = KP_Divide KP_Divide
 keyCode 112 = F1
 keyCode 113 = F2
 keyCode 114 = F3
 keyCode 115 = F4
 keyCode 116 = F5
 keyCode 117 = F6
 keyCode 118 = F7
 keyCode 119 = F8
 keyCode 120 = F9
 keyCode 121 = F10
 keyCode 122 = F11
 keyCode 123 = F12
 keyCode 124 = F13
 keyCode 125 = F14
 keyCode 126 = F15
 keyCode 127 = F16
 keyCode 128 = F17
 keyCode 129 = F18
 keyCode 130 = F19
 keyCode 131 = F20
 keyCode 132 = F21
 keyCode 133 = F22
 keyCode 134 = F23
 keyCode 135 = F24
 keyCode 136 = Num_Lock
 keyCode 137 = Scroll_Lock
 keyCode 187 = acute grave
 keyCode 188 = comma semicolon
 keyCode 189 = minus underscore
 keyCode 190 = period colon
 keyCode 192 = numbersign apostrophe
 keyCode 210 = plusminus hyphen macron
 keyCode 211 =
 keyCode 212 = copyright registered
 keyCode 213 = guillemotleft guillemotright
 keyCode 214 = masculine ordfeminine
 keyCode 215 = ae AE
 keyCode 216 = cent yen
 keyCode 217 = questiondown exclamdown
 keyCode 218 = onequarter onehalf threequarters
 keyCode 220 = less greater bar
 keyCode 221 = plus asterisk asciitilde
 keyCode 227 = multiply division
 keyCode 228 = acircumflex Acircumflex
 keyCode 229 = ecircumflex Ecircumflex
 keyCode 230 = icircumflex Icircumflex
 keyCode 231 = ocircumflex Ocircumflex
 keyCode 232 = ucircumflex Ucircumflex
 keyCode 233 = ntilde Ntilde
 keyCode 234 = yacute Yacute
 keyCode 235 = oslash Ooblique
 keyCode 236 = aring Aring
 keyCode 237 = ccedilla Ccedilla
 keyCode 238 = thorn THORN
 keyCode 239 = eth ETH
 keyCode 240 = diaeresis cedilla currency
 keyCode 241 = agrave Agrave atilde Atilde
 keyCode 242 = egrave Egrave
 keyCode 243 = igrave Igrave
 keyCode 244 = ograve Ograve otilde Otilde
 keyCode 245 = ugrave Ugrave
 keyCode 246 = adiaeresis Adiaeresis
 keyCode 247 = ediaeresis Ediaeresis
 keyCode 248 = idiaeresis Idiaeresis
 keyCode 249 = odiaeresis Odiaeresis
 keyCode 250 = udiaeresis Udiaeresis
 keyCode 251 = ssharp question backslash
 keyCode 252 = asciicircum degree
 keyCode 253 = 3 sterling
 keyCode 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 　　0X85
 B　　0X66　 V　　 0X86
 C　　0X67　 W　　 0X87
 D　　0X68　 X 　　0X88
 E　　0X69　 Y　　 0X89
 F　　0X70　 Z　　 0X90
 G　　0X71　 0　　 0X48
 H　　0X72　 1　　 0X49
 I　　0X73　 2　　 0X50
 J　　0X74　 3 　　0X51
 K　　0X75　 4 　　0X52
 L　　0X76　 5 　　0X53
 M　　0X77　 6　　 0X54
 N　　0X78 　7 　　0X55
 O　　0X79 　8 　　0X56
 P　　0X80 　9 　　0X57
 Q　　0X81　ESC　　0X1B
 R　　0X82　CTRL 　0X11
 S　　0X83　SHIFT　0X10
 T　　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

感谢网络各路大神提供。