判断页面滚动到某一位置所发生的事件：
$(window).bind('scroll', function () { //算出鼠标移动到顶部的高度。 var scrollt = document.documentElement.scrollTop + document.body.scrollTop; if (scrollt > 600) { $(".return").fadeIn(500); //进行操作。 } else { $(".return").fadeOut(500); } })
页面内获取键盘按键事件：
document.onkeydown = function (event) { var e=event||window.event||arguments.callee.caller.arguments[0]; if (e && e.keyCode == 13) { } }
1 js 里面的键盘事件经常用到，所以收集了键盘事件对应的键码来分享下： 2 keyCode 8 = BackSpace BackSpace 3 keyCode 9 = Tab Tab 4 keyCode 12 = Clear 5 keyCode 13 = Enter 6 keyCode 16 = Shift_L 7 keyCode 17 = Control_L 8 keyCode 18 = Alt_L 9 keyCode 19 = Pause 10 keyCode 20 = Caps_Lock 11 keyCode 27 = Escape Escape 12 keyCode 32 = space 13 keyCode 33 = Prior 14 keyCode 34 = Next 15 keyCode 35 = End 16 keyCode 36 = Home 17 keyCode 37 = Left 18 keyCode 38 = Up 19 keyCode 39 = Right 20 keyCode 40 = Down 21 keyCode 41 = Select 22 keyCode 42 = Print 23 keyCode 43 = Execute 24 keyCode 45 = Insert 25 keyCode 46 = Delete 26 keyCode 47 = Help 27 keyCode 48 = 0 equal braceright 28 keyCode 49 = 1 exclam onesuperior 29 keyCode 50 = 2 quotedbl twosuperior 30 keyCode 51 = 3 section threesuperior 31 keyCode 52 = 4 dollar 32 keyCode 53 = 5 percent 33 keyCode 54 = 6 ampersand 34 keyCode 55 = 7 slash braceleft 35 keyCode 56 = 8 parenleft bracketleft 36 keyCode 57 = 9 parenright bracketright 37 keyCode 65 = a A 38 keyCode 66 = b B 39 keyCode 67 = c C 40 keyCode 68 = d D 41 keyCode 69 = e E EuroSign 42 keyCode 70 = f F 43 keyCode 71 = g G 44 keyCode 72 = h H 45 keyCode 73 = i I 46 keyCode 74 = j J 47 keyCode 75 = k K 48 keyCode 76 = l L 49 keyCode 77 = m M mu 50 keyCode 78 = n N 51 keyCode 79 = o O 52 keyCode 80 = p P 53 keyCode 81 = q Q at 54 keyCode 82 = r R 55 keyCode 83 = s S 56 keyCode 84 = t T 57 keyCode 85 = u U 58 keyCode 86 = v V 59 keyCode 87 = w W 60 keyCode 88 = x X 61 keyCode 89 = y Y 62 keyCode 90 = z Z 63 keyCode 96 = KP_0 KP_0 64 keyCode 97 = KP_1 KP_1 65 keyCode 98 = KP_2 KP_2 66 keyCode 99 = KP_3 KP_3 67 keyCode 100 = KP_4 KP_4 68 keyCode 101 = KP_5 KP_5 69 keyCode 102 = KP_6 KP_6 70 keyCode 103 = KP_7 KP_7 71 keyCode 104 = KP_8 KP_8 72 keyCode 105 = KP_9 KP_9 73 keyCode 106 = KP_Multiply KP_Multiply 74 keyCode 107 = KP_Add KP_Add 75 keyCode 108 = KP_Separator KP_Separator 76 keyCode 109 = KP_Subtract KP_Subtract 77 keyCode 110 = KP_Decimal KP_Decimal 78 keyCode 111 = KP_Divide KP_Divide 79 keyCode 112 = F1 80 keyCode 113 = F2 81 keyCode 114 = F3 82 keyCode 115 = F4 83 keyCode 116 = F5 84 keyCode 117 = F6 85 keyCode 118 = F7 86 keyCode 119 = F8 87 keyCode 120 = F9 88 keyCode 121 = F10 89 keyCode 122 = F11 90 keyCode 123 = F12 91 keyCode 124 = F13 92 keyCode 125 = F14 93 keyCode 126 = F15 94 keyCode 127 = F16 95 keyCode 128 = F17 96 keyCode 129 = F18 97 keyCode 130 = F19 98 keyCode 131 = F20 99 keyCode 132 = F21 100 keyCode 133 = F22 101 keyCode 134 = F23 102 keyCode 135 = F24 103 keyCode 136 = Num_Lock 104 keyCode 137 = Scroll_Lock 105 keyCode 187 = acute grave 106 keyCode 188 = comma semicolon 107 keyCode 189 = minus underscore 108 keyCode 190 = period colon 109 keyCode 192 = numbersign apostrophe 110 keyCode 210 = plusminus hyphen macron 111 keyCode 211 = 112 keyCode 212 = copyright registered 113 keyCode 213 = guillemotleft guillemotright 114 keyCode 214 = masculine ordfeminine 115 keyCode 215 = ae AE 116 keyCode 216 = cent yen 117 keyCode 217 = questiondown exclamdown 118 keyCode 218 = onequarter onehalf threequarters 119 keyCode 220 = less greater bar 120 keyCode 221 = plus asterisk asciitilde 121 keyCode 227 = multiply division 122 keyCode 228 = acircumflex Acircumflex 123 keyCode 229 = ecircumflex Ecircumflex 124 keyCode 230 = icircumflex Icircumflex 125 keyCode 231 = ocircumflex Ocircumflex 126 keyCode 232 = ucircumflex Ucircumflex 127 keyCode 233 = ntilde Ntilde 128 keyCode 234 = yacute Yacute 129 keyCode 235 = oslash Ooblique 130 keyCode 236 = aring Aring 131 keyCode 237 = ccedilla Ccedilla 132 keyCode 238 = thorn THORN 133 keyCode 239 = eth ETH 134 keyCode 240 = diaeresis cedilla currency 135 keyCode 241 = agrave Agrave atilde Atilde 136 keyCode 242 = egrave Egrave 137 keyCode 243 = igrave Igrave 138 keyCode 244 = ograve Ograve otilde Otilde 139 keyCode 245 = ugrave Ugrave 140 keyCode 246 = adiaeresis Adiaeresis 141 keyCode 247 = ediaeresis Ediaeresis 142 keyCode 248 = idiaeresis Idiaeresis 143 keyCode 249 = odiaeresis Odiaeresis 144 keyCode 250 = udiaeresis Udiaeresis 145 keyCode 251 = ssharp question backslash 146 keyCode 252 = asciicircum degree 147 keyCode 253 = 3 sterling 148 keyCode 254 = Mode_switch 149 使用event对象的keyCode属性判断输入的键值 150 eg：if(event.keyCode==13)alert(“enter!”); 151 键值对应表 152 A 0X65 U 0X85 153 B 0X66 V 0X86 154 C 0X67 W 0X87 155 D 0X68 X 0X88 156 E 0X69 Y 0X89 157 F 0X70 Z 0X90 158 G 0X71 0 0X48 159 H 0X72 1 0X49 160 I 0X73 2 0X50 161 J 0X74 3 0X51 162 K 0X75 4 0X52 163 L 0X76 5 0X53 164 M 0X77 6 0X54 165 N 0X78 7 0X55 166 O 0X79 8 0X56 167 P 0X80 9 0X57 168 Q 0X81 ESC 0X1B 169 R 0X82 CTRL 0X11 170 S 0X83 SHIFT 0X10 171 T 0X84 ENTER 0XD 172 如果要使用组合键，则可以判断是否同时按下了这几个键，比如ctrl键、shift键以及alt键的组合使用就可以判断是否多按下了ctrl键、shift键以及alt键