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 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
使用示例：
$(window).keydown(function(event){ switch(event.keycode) { // ... // 不同的按键可以做不同的事情 // 不同的浏览器的keycode不同 // 更多详细信息: http://unixpapa.com/js/key.html } });
针对特定表单元素：
$("#post_tags").keydown(function(event){ switch(event.keycode){ case 13: alert(this.value); break; } });
在此之前，需要将绑定在表单submit按钮上的onkeydown事件去除才可以正常使用，否则会执行该js代码后提交表单：
将
<input type=submit>
改为
<input type=button onclick="javascript:if(confirm('ok')){this.form.submit();}">
即可。