js获取按键

event.altKey、event.ctrlKey、event.shiftKey 属性

属性为true表示事件发生时Alt、Ctrl、Shift键被按下并保持，为false则Alt、Ctrl、Shift键没有按下

例子1：按住"Shift"键并用鼠标点击上面的色块，可改变色块颜色

<div id="box" style="width:50px; height:25px;border:1px solid black; background-color:red" onclick="setColor(event)"></div>

<script type="text/javascript">

var b = true;

function setColor(oEvent)  {

if( oEvent.shiftKey && b )

document.getElementById("box").style.backgroundColor = "blue";  if( oEvent.shiftKey && !b )

document.getElementById("box").style.backgroundColor = "red";

b = !b;

}

例子2： 使用"Ctrl+Del"组合键可清除上面的文本框的内容

<input id="txt2" type="text" value="Hello World!" onclick="clearText(event)" />

<script type="text/javascript">

function clearText(oEvent)  {

if( oEvent.ctrlKey && oEvent.keyCode==46 )

document.getElementById("txt2").value = "";

}

</script>

document.onkeydown=function(event){

var e = event || window.event || arguments.callee.caller.arguments[0];
if(e && e.keyCode==18){

}
if(e && e.keyCode==113){ // 按 F2
//要做的事情
}
if(e && e.keyCode==13){ // enter 键
//要做的事情
}
};

js 里面的键盘事件经常用到的键盘事件对应的键码

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