js鍵盤操作_js監控鍵盤的上下左右

1. 用js怎麼寫一個回車鍵盤事件

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 鍵

//要做的事情

}

};

</script>

(1)js鍵盤操作擴展閱讀：

Js鍵盤事件

keydown：按鍵按下

keyup：按鍵抬起

keypress：按鍵按下抬起

<body>

</body>

/*輸出輸入的字元*/

function myKeyDown(id) {

console.log(document.getElementById(id).value);

}

/*按鍵結束，字體轉換為大寫*/

function myKeyUp(id) {

var text = document.getElementById(id).value;

document.getElementById(id).value = text.toUpperCase();

}

</script>

常用的鍵盤事件對應的鍵碼：

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

2. js鍵盤事件，判斷按下的是哪個鍵

Js判斷鍵盤按鍵

window.document.onkeydown = disableRefresh;
function disableRefresh(evt){
evt = (evt) ? evt : window.event
if (evt.keyCode) {
if(evt.keyCode == 116){
//do something
}
}
}
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 = right 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對象的keyCode屬性判斷輸入的鍵值
eg：if(event.keyCode==13){
var ieKey=event.keyCode;//獲得鍵值，數字形式的
var realkey=String.fromCharCode(ieKey) //將數字形式的鍵值轉化為真實的按鍵
alert(realkey);
}
鍵值對應表
A0X65 U 0X85
B0X66 V 0X86
C0X67 W 0X87
D0X68 X 0X88
E0X69 Y 0X89
F0X70 Z 0X90
G0X71 0 0X48
H0X72 1 0X49
I0X73 2 0X50
J0X74 3 0X51
K0X75 4 0X52
L0X76 5 0X53
M0X77 6 0X54
N0X78 7 0X55
O0X79 8 0X56
P0X80 9 0X57
Q0X81ESC0X1B
R0X82CTRL 0X11
S0X83SHIFT0X10
T0X84ENTER0XD
如果要使用組合鍵，則可以利用event.ctrlKey，event.shiftKey，event .altKey判斷
是否按下了ctrl鍵、shift鍵以及alt鍵

3. JS求助，鍵盤事件和單擊事件，限制只執行一次

可以用jQuery的one方法只執行一次。

1、新建html文檔，在body標簽中添加一個按鈕，然後在head標簽中引入jQuery文件：

4. js監控鍵盤的上下左右,多按一個鍵,另一個鍵就會失效,怎麼解決

所有的游戲方向鍵控制思路都是這樣的：
設置變數moveX，moveY，初始值是0
監控鍵盤，當左鍵按下時moveX--，當左鍵松開時moveX++，右鍵按下時moveX++，右鍵松開時moveX--。上下鍵同理。
然後每一次游戲邏輯循環（間隔觸發的事件，js可以用setInterval），根據moveX、moveY來改變被控制人物的位置。
這樣就可以實現人物的平滑移動同時也能解決你所說兩個按鍵同時按下的問題。

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js鍵盤操作

(1)js鍵盤操作擴展閱讀：

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