js通过keyCode值判断单击键盘上某个键,然后触发指定的事件方法

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