js 没有办法对手机软键盘直接进行监听的
那是否可以对 input 失去焦点进行监听
搜一了一个 MDN Web 文档 ，发现
focus 和 blur 不会冒泡，而 focusin 和 focusout 可以支持冒泡，加事件代理，当触发 focusout 事件后滚一下
测试后发现 ios 可以监听到 focusout 事件，而 android 在键盘收起后，input 仍处于焦点状态，无法触发 focusout 事件
添加 resize 事件后 发现 android 在唤起键盘收起键盘后 window.innerHeight 会有改变，而 ios 不会
js 移动端对键盘监听
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。<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
}
}
键盘的每个键都有对应的事件值，用按键按下或抬起事件，就可以绑定了，事件和对应值如下：1、keydown()
keydown事件会在键盘按下时触发.
2、keyup()
keyup事件会在按键释放时触发,也就是你按下键盘起来后的事件
3、keypress()
keypress事件会在敲击按键时触发,我们可以理解为按下并抬起同一个按键
对应值：
keycode 8 = BackSpace BackSpace
keycode 9 = Tab Tab
keycode12 = Clear
keycode13 = Enter
keycode16 = Shift_L
keycode17 = Control_L
keycode18 = Alt_L
keycode19 = Pause
keycode20 = Caps_Lock
keycode27 = Escape Escape
keycode32 = space space
keycode33 = Prior
keycode34 = Next
keycode35 = End
keycode36 = Home
keycode37 = Left
keycode38 = Up
keycode39 = Right
keycode40 = Down
keycode41 = Select
keycode42 = Print
keycode43 = Execute
keycode45 = Insert
keycode46 = Delete
keycode47 = Help
keycode48 = 0 equal braceright
keycode49 = 1 exclam onesuperior
keycode50 = 2 quotedbl twosuperior
keycode51 = 3 section threesuperior
keycode52 = 4 dollar
keycode53 = 5 percent
keycode54 = 6 ampersand
keycode55 = 7 slash braceleft
keycode56 = 8 parenleft bracketleft
keycode57 = 9 parenright bracketright
keycode65 = a A
keycode66 = b B
keycode67 = c C
keycode68 = d D
keycode69 = e E EuroSign
keycode70 = f F
keycode71 = g G
keycode72 = h H
keycode73 = i I
keycode74 = j J
keycode75 = k K
keycode76 = l L
keycode77 = m M mu
keycode78 = n N
keycode79 = o O
keycode80 = p P
keycode81 = q Q at
keycode82 = r R
keycode83 = s S
keycode84 = t T
keycode85 = u U
keycode86 = v V
keycode87 = w W
keycode88 = x X
keycode89 = y Y
keycode90 = z Z
keycode96 = KP_0 KP_0
keycode97 = KP_1 KP_1
keycode98 = KP_2 KP_2
keycode99 = 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
