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全屏显示
<input type="button" name="fullscreen" value="全屏显示" onclick="window.open(document.location, 'www_helpor_net', 'fullscreen')"> 

<script language="javascript">
    function WALL_web() {
        var WshShell = new ActiveXObject('WScript.Shell')
        WshShell.SendKeys('{F11}');
    }
    window.onload = WALL_web;
</script>
  
窗口x坐标:window.screenLeft    
窗口宽度:window.document.body.clientWidth   
屏幕宽度:window.screen.width   
if(window.screenLeft == 0 && window.document.body.clientWidth == window.screen.width){   
  alert("全屏");   
}

当单击按键时触发事件 

 document.onkeydown = function (e) {

            e = e || event;

            if (e.keyCode == 13) {  //判断是否单击的enter按键(回车键)

                document.getElementByIdx_x_x("txtid").click();

                return false;

            }

   }

 

解释：keycode的值表示对应键盘的那个键

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