关于如何得到一个键在Javascript中的Keycode值，可以参考：
<body onkeypress=alert(event.keyCode)>请按任意键，你将得到该键的键值！

keycode
0 =
keycode 1 =
keycode 2 =
keycode 3 =
keycode 4 =
keycode
5 =
keycode 6 =
keycode 7 =
keycode 8 = BackSpace BackSpace

keycode 9 = Tab Tab
keycode 10 =
keycode 11 =
keycode 12 = Clear

keycode 13 = Enter
keycode 14 =
keycode 15 =
keycode 16 =
Shift_L
keycode 17 = Control_L
keycode 18 = Alt_L
keycode 19 = Pause

keycode 20 = Caps_Lock
keycode 21 =
keycode 22 =
keycode 23 =

keycode 24 =
keycode 25 =
keycode 26 =
keycode 27 = Escape
Escape
keycode 28 =
keycode 29 =
keycode 30 =
keycode 31 =

keycode 32 = space 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 44 =
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 58 =
keycode 59 =
keycode 60 =
keycode 61 =

keycode 62 =
keycode 63 =
keycode 64 =
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 91 =
keycode 92 =
keycode 93 =
keycode 94 =
keycode
95 =
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 138 =
keycode 139 =
keycode 140 =
keycode
141 =
keycode 142 =
keycode 143 =
keycode 144 =
keycode 145 =

keycode 146 =
keycode 147 =
keycode 148 =
keycode 149 =

keycode 150 =
keycode 151 =
keycode 152 =
keycode 153 =

keycode 154 =
keycode 155 =
keycode 156 =
keycode 157 =

keycode 158 =
keycode 159 =
keycode 160 =
keycode 161 =

keycode 162 =
keycode 163 =
keycode 164 =
keycode 165 =

keycode 166 =
keycode 167 =
keycode 168 =
keycode 169 =

keycode 170 =
keycode 171 =
keycode 172 =
keycode 173 =

keycode 174 =
keycode 175 =
keycode 176 =
keycode 177 =

keycode 178 =
keycode 179 =
keycode 180 =
keycode 181 =

keycode 182 =
keycode 183 =
keycode 184 =
keycode 185 =

keycode 186 =
keycode 187 = acute grave
keycode 188 = comma
semicolon
keycode 189 = minus underscore
keycode 190 = period colon

keycode 191 =
keycode 192 = numbersign apostrophe
keycode 193 =

keycode 194 =
keycode 195 =
keycode 196 =
keycode 197 =

keycode 198 =
keycode 199 =
keycode 200 =
keycode 201 =

keycode 202 =
keycode 203 =
keycode 204 =
keycode 205 =

keycode 206 =
keycode 207 =
keycode 208 =
keycode 209 =

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 219 =
keycode 220 = less greater bar
keycode
221 = plus asterisk asciitilde
keycode 222 =
keycode 223 =
keycode
224 =
keycode 225 =
keycode 226 =
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 

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