用js实现键盘记录，要知道的三种按键事件类型，即keydown，keypress和keyup，它们分别对应onkeydown、 onkeypress和onkeyup这三个事件。一个典型的按键会产生所有这三种事件，依次是keydown ?→ keypress，然后是按键释放时 候的keyup。
keydown和 keypress 有什么区别呢？
答：http://www.chenzejiang.com/?p=228
键码值集合大全
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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 |
上面的键码唯独没有ctrl ，如果按下了 ctrl 要执行事件要怎么办呢？ 我们可以使用 ctrlkey 如下
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document.onkeydown = function(evt){ var e = e || window.event; if(e.ctrlKey){ alert("ctrl键不能使用"); } } |
组合键要怎么办？ 使用 && 运算符
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document.onkeydown = function(evt){ var e = e || window.event; if(e.ctrlKey && e.keyCode == 83){ alert("ctrl+s不能使用"); } } |
使用event对象得到输入的键值，和键码
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document.onkeypress = function(evt) { alert('你按下了' + String.fromCharCode(getCharCode(evt)) + ' 它的ASCII码是' + getCharCode(evt)); } //字符按键兼容 function getCharCode(evt) { var e = evt || window.event; if(typeof e.charCode =='number') { return e.charCode; // 非IE } else { return e.keyCode; // IE } } |
判断键盘上下左右按键事件
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document.onkeydown=function(event){ var e = event || window.event; if(e && e.keyCode==38){ alert('你按下了上建'); } if(e && e.keyCode==37){ alert('你按下了左键') } if(e && e.keyCode==40){ alert('你按下了下键'); } if(e && e.keyCode==39){ alert('你按下了右键'); } }; |
PS：其他按键也是一样，例如经常可以看到通过按下 Enter键可以登录某个网站，也是可以通过这个去执行
PS：e = e||window.event;这句代码是为了进行浏览器事件对象获取的兼容。js中这句代码的意思是，如果在非IE浏览器，隐藏的变量e是存在的，那么e||event返回e，如果在IE中，隐藏变量e是不存在，则返回event。