问题：实现输入框内点击键盘Enter事件。
解决：先找输入框这个元素，再使用keypress方法，Enter对应数字13，代码如下：
$("#id").keypress(function (even) {if (even.which == 13) {alert("这里做事件触发的效果");}}});
后续问题：输入框的回车效果实现了，但实现后又会马上自动刷新页面，造成回车的效果又消失了。
解决：当form表单中只有一个input标签时按回车键将会自动将表单提交。可以再添加一个input标签 然后隐藏掉，代码如下:
<input type="text" id="" name="" style="display: none;"/>
补充：下面是键盘下的键值对应的数字
keyCode 8 = BackSpace BackSpacekeyCode 9 = Tab TabkeyCode 12 = ClearkeyCode 13 = EnterkeyCode 16 = Shift_LkeyCode 17 = Control_LkeyCode 18 = Alt_LkeyCode 19 = PausekeyCode 20 = Caps_LockkeyCode 27 = Escape EscapekeyCode 32 = spacekeyCode 33 = PriorkeyCode 34 = NextkeyCode 35 = EndkeyCode 36 = HomekeyCode 37 = LeftkeyCode 38 = UpkeyCode 39 = RightkeyCode 40 = DownkeyCode 41 = SelectkeyCode 42 = PrintkeyCode 43 = ExecutekeyCode 45 = InsertkeyCode 46 = DeletekeyCode 47 = HelpkeyCode 48 = 0 equal bracerightkeyCode 49 = 1 exclam onesuperiorkeyCode 50 = 2 quotedbl twosuperiorkeyCode 51 = 3 section threesuperiorkeyCode 52 = 4 dollarkeyCode 53 = 5 percentkeyCode 54 = 6 ampersandkeyCode 55 = 7 slash braceleftkeyCode 56 = 8 parenleft bracketleftkeyCode 57 = 9 parenright bracketrightkeyCode 65 = a AkeyCode 66 = b BkeyCode 67 = c CkeyCode 68 = d DkeyCode 69 = e E EuroSignkeyCode 70 = f FkeyCode 71 = g GkeyCode 72 = h HkeyCode 73 = i IkeyCode 74 = j JkeyCode 75 = k KkeyCode 76 = l LkeyCode 77 = m M mukeyCode 78 = n NkeyCode 79 = o OkeyCode 80 = p PkeyCode 81 = q Q atkeyCode 82 = r RkeyCode 83 = s SkeyCode 84 = t TkeyCode 85 = u UkeyCode 86 = v VkeyCode 87 = w WkeyCode 88 = x XkeyCode 89 = y YkeyCode 90 = z ZkeyCode 96 = KP_0 KP_0keyCode 97 = KP_1 KP_1keyCode 98 = KP_2 KP_2keyCode 99 = KP_3 KP_3keyCode 100 = KP_4 KP_4keyCode 101 = KP_5 KP_5keyCode 102 = KP_6 KP_6keyCode 103 = KP_7 KP_7keyCode 104 = KP_8 KP_8keyCode 105 = KP_9 KP_9keyCode 106 = KP_Multiply KP_MultiplykeyCode 107 = KP_Add KP_AddkeyCode 108 = KP_Separator KP_SeparatorkeyCode 109 = KP_Subtract KP_SubtractkeyCode 110 = KP_Decimal KP_DecimalkeyCode 111 = KP_Divide KP_DividekeyCode 112 = F1keyCode 113 = F2keyCode 114 = F3keyCode 115 = F4keyCode 116 = F5keyCode 117 = F6keyCode 118 = F7keyCode 119 = F8keyCode 120 = F9keyCode 121 = F10keyCode 122 = F11keyCode 123 = F12keyCode 124 = F13keyCode 125 = F14keyCode 126 = F15keyCode 127 = F16keyCode 128 = F17keyCode 129 = F18keyCode 130 = F19keyCode 131 = F20keyCode 132 = F21keyCode 133 = F22keyCode 134 = F23keyCode 135 = F24keyCode 136 = Num_LockkeyCode 137 = Scroll_LockkeyCode 187 = acute gravekeyCode 188 = comma semicolonkeyCode 189 = minus underscorekeyCode 190 = period colonkeyCode 192 = numbersign apostrophekeyCode 210 = plusminus hyphen macronkeyCode 211 =keyCode 212 = copyright registeredkeyCode 213 = guillemotleft guillemotrightkeyCode 214 = masculine ordfemininekeyCode 215 = ae AEkeyCode 216 = cent yenkeyCode 217 = questiondown exclamdownkeyCode 218 = onequarter onehalf threequarterskeyCode 220 = less greater barkeyCode 221 = plus asterisk asciitildekeyCode 227 = multiply divisionkeyCode 228 = acircumflex AcircumflexkeyCode 229 = ecircumflex EcircumflexkeyCode 230 = icircumflex IcircumflexkeyCode 231 = ocircumflex OcircumflexkeyCode 232 = ucircumflex UcircumflexkeyCode 233 = ntilde NtildekeyCode 234 = yacute YacutekeyCode 235 = oslash OobliquekeyCode 236 = aring AringkeyCode 237 = ccedilla CcedillakeyCode 238 = thorn THORNkeyCode 239 = eth ETHkeyCode 240 = diaeresis cedilla currencykeyCode 241 = agrave Agrave atilde AtildekeyCode 242 = egrave EgravekeyCode 243 = igrave IgravekeyCode 244 = ograve Ograve otilde OtildekeyCode 245 = ugrave UgravekeyCode 246 = adiaeresis AdiaeresiskeyCode 247 = ediaeresis EdiaeresiskeyCode 248 = idiaeresis IdiaeresiskeyCode 249 = odiaeresis OdiaeresiskeyCode 250 = udiaeresis UdiaeresiskeyCode 251 = ssharp question backslashkeyCode 252 = asciicircum degreekeyCode 253 = 3 sterlingkeyCode 254 = Mode_switch使用event对象的keyCode属性判断输入的键值eg：if(event.keyCode==13)alert(“enter!”);键值对应表A0X65 U 0X85B0X66 V 0X86C0X67 W 0X87D0X68 X 0X88E0X69 Y 0X89F0X70 Z 0X90G0X71 0 0X48H0X72 1 0X49I0X73 2 0X50J0X74 3 0X51K0X75 4 0X52L0X76 5 0X53M0X77 6 0X54N0X78 7 0X55O0X79 8 0X56P0X80 9 0X57Q0X81ESC0X1BR0X82CTRL 0X11S0X83SHIFT0X10T0X84ENTER0XD
