原生js实现滚动到顶部和底部,绑定快捷键

来源:赵克立博客 分类: 前端设计 标签:JS高级语法js函数js特效发布时间:2019-04-26 16:36:52最后更新:2019-05-02 14:42:10浏览:283
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2019-05-02 14:42:10

滚动到顶部/底部

浏览网页时常看到一些一键返回顶部或到底部的代码,像这样的小功能如果再引入一个第三方库的话就有点多余啦,下面是一段js用两个函数实现啦功能,默认是绑定到window上面按下ctrl+up/ctrl+down实现对应的功能

 (function() {
     var doMoveTop = function() {
         var iSpeed = 0;
         var top = document.documentElement.scrollTop || document.body.scrollTop;
         iSpeed = (0 - top) / 5;
         iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
         if (Math.abs(iSpeed) < 1 && Math.abs(0 - top) < 1) {
             clearInterval(TimerId);
             TimerId = null;
         }
         window.scrollTo(0, (top + iSpeed));
     };
     var doMoveBottom = function() {
         var iSpeed = 0;
         var top = document.documentElement.scrollTop || document.body.scrollTop;
         var scrollHeight = document.documentElement.scrollHeight; //滚动条总高度
         var clientHeight = document.documentElement.clientHeight; //可视高度
         bottom = scrollHeight - clientHeight - top;
         iSpeed = (0 - bottom) / 5;
         iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);
         if (Math.abs(iSpeed) < 1 && Math.abs(0 - bottom) < 1) {
             clearInterval(TimerId);
             TimerId = null;
         }
         window.scrollTo(0, (top - iSpeed));
     };
     var TimerId = null;
     window.onkeydown = function(event) {
         TimerId && clearInterval(TimerId);
         if (event.ctrlKey) {
             if (event.keyCode == 38) {
                 TimerId = setInterval(doMoveTop, 30);
             } else if (event.keyCode == 40) {
                 TimerId = setInterval(doMoveBottom, 30);
             }
         }
     }
 })();

1.gif

转换成真实按键

//使用event对象的keyCode属性判断输入的键值
if(event.keyCode==13){
    var ieKey=event.keyCode;//获得键值,数字形式的
    var realkey=String.fromCharCode(ieKey) //将数字形式的键值转化为真实的按键
    alert(realkey);
}

快捷键映射说明

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 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



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