js获取及判断按键的方法

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：

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

js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判断键盘按键

 

window.document.onkeydown = disableRefresh;

function disableRefresh(evt){

evt = (evt) ? evt : window.event

if (evt.keyCode) {

  if(evt.keyCode == 116){

   //do something

  }

}

}

 

键码同上例所示。

使用event对象的keyCode属性判断输入的键值

if(event.keyCode==13){

var ieKey=event.keyCode;//获得键值，数字形式的

var realkey=String.fromCharCode(ieKey) //将数字形式的键值转化为真实的按键

alert(realkey);

}