事件修饰符：

 1. .stop（常用） 阻止冒泡
 2. .prevent（常用） 取消默认事件
 3. .capture  使用事件的捕获模式；
 4. .self 只有event.target是当前操作的元素时才触发事件；
 5. .once（常用） 只执行一次点击   
 6. .passive：事件的默认行为立即执行，无需等待事件回调执行完毕；

输入框 键盘修饰符：

@keydown (键盘 键 按下)
@keyup (键盘 键 抬起)
如 监听回车：

	 <input @keydown.enter="helloWorldFather"  / >

鼠标按钮修饰符

.left （监听左键）
.right （监听右键）
.middle（监听 中间案件）

如：@click.right (监听右键)

系统修饰符

@click.shift 按住shift再点击
.alt （先按 alt再点击）
.ctrl …
.meta

自定义修饰符

main.js 中

 import Vue from 'vue'
 Vue.config.keyCodes = {
   f2: 113,
 };

键盘 对应 键 位

 键盘 对应 码
	  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
	  
	  键值对应表
	  A　　0X65 　U 　　0X85
	  B　　0X66　 V　　 0X86
	  C　　0X67　 W　　 0X87
	  D　　0X68　 X 　　0X88
	  E　　0X69　 Y　　 0X89
	  F　　0X70　 Z　　 0X90
	  G　　0X71　 0　　 0X48
	  H　　0X72　 1　　 0X49
	  I　　0X73　 2　　 0X50
	  J　　0X74　 3 　　0X51
	  K　　0X75　 4 　　0X52
	  L　　0X76　 5 　　0X53
	  M　　0X77　 6　　 0X54
	  N　　0X78 　7 　　0X55
	  O　　0X79 　8 　　0X56
	  P　　0X80 　9 　　0X57
	  Q　　0X81　ESC　　0X1B
	  R　　0X82　CTRL 　0X11
	  S　　0X83　SHIFT　0X10
	  T　　0X84　ENTER　0XD