JS的Event對象是觸發事件的時候傳遞給事件處理函數的一個對象，這個對象中存在觸發事件的基本信息。如：觸發事件的事件源、鍵盤碼（如果存在）等基本信息。
1、通過event.type獲取事件的類型
代碼如下:
<script>
$(function(){
$("a").click(function(event) {
alert(event.type);//獲取事件類型
//return false;//阻止鏈接跳轉
event.preventDefault();
});
})
</script>
2、獲取事件目標的屬性值
html部分代碼如下：
代碼如下:
<body>
<a href='http://google.com'>click me .</a>
</body>
代碼如下:
<script>
$(function(){
$("a[href=http://google.com]").click(function(event) {
alert(event.target.href);//獲取觸發事件的<a>元素的href屬性值
return false;//阻止鏈接跳轉
});
})
</script>
可以獲取到屬性href的值為‘http://google.com'。
3、獲取鼠標對應的坐標值x與y
代碼如下:
<script>
$(function(){
$("a").click(function(e) {
alert("Current mouse position: " + e.pageX + ", " + e.pageY );//獲取鼠標當前相對於頁面的坐標
return false;//阻止鏈接跳轉
});
})
</script>
這裡傳遞的參數名不一定非要是event，可以是任意的名稱，只要後面的相對應就可以。默認傳入的值為event。如果你不給參數的話，就會默認傳入一個叫event的參數。
4、which屬性可以獲取相應的事件對應的值
which 屬性指示按了哪個鍵或按鈕。
代碼如下:
<script>
$(function(){
$("a").mousedown(function(e){
alert(e.which) // 1 = 鼠標左鍵 left; 2 = 鼠標中鍵; 3 = 鼠標右鍵
return false;//阻止鏈接跳轉
})
})
</script>
關於如何得到一個鍵在Javascript中的Keycode值，可以參考：
代碼如下:
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 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
以上是js中的鍵值參考，其中比較重要的有13（enter），32（空格），27（ESC），16（Shift），17（Ctrl），18（Alt）。
更多的值可以通過下面的jQuery來獲取：
代碼如下:
<script>
$(function(){
$("input").keyup(function(e){//獲取keyup時間的值
alert(e.which);
})
})
</script>