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为什么电脑数字键盘是“789在上”,而拨号键盘却是“123在上”?��

为什么电脑数字键盘是“789在上”,而拨号键盘却是“123在上”?��

前两天大毛有个惊人的发现

难得大毛问出那么有深度的问题

这不怎么也得出一篇

首先,“789”在上的数字键盘是老资历

因为当时的机械加法机结构

数值是从下往上累加的

会计人员习惯了从下往上打起

为了方便会计员盲打

当时的计算器键盘都是789在上

而键盘的第一批用户

也主要是干会计的

所以电脑键盘就直接照搬了

一切为了客户

而电话商面对的客户就不只会计了

所以当电话从旋钮转变成按键时

当时的电话商进行了一场轰轰烈烈的

汇集心理学、人体工程力学的实验

最后测试出来

大家最喜欢的方式是

再结合电话的样式稍作调整

电话按键就变成了如今的3×3的样式

我相信能点进来这篇的盆友

都是好学之辈

就再给你们来点能出去装一装

展示自我的知识

毕竟键盘这东西真挺怪的

能说道的东西还真不少

Ctrl全称Control(控制)

关于它有一堆快捷键

之所以,Ctrl应用如此之广

是因为,在计算机中

所有的数据都要使用二进制数表示

包括a、b、c、d这样的字母

以及*、#、@等字符

而Ctrl的作用就是

把组合字母键的二进制码的

高两位强制归零

比方说字母G的

二进制表达规定为

1000111

Ctrl+G之后

它就变成了

0000111,也就是数字7

而在电脑编码系统中

7表示响铃🔔

所以Ctrl+G就是响铃的快捷键

另外,虽然我知道

Ctrl + C 和 Ctrl + V

是大部分人最常用的快捷键吧

毕竟其他的快捷键也记不住

但其实当年的Ctrl+C

表示的是“中断程序”

是给程序员在写出“死循环程序”

用来救命的

所以早期“复制”、“粘贴”的快捷键

一点也不快捷

Ctrl + Insert = 复制

Shift + Insert = 粘贴

不过两个“快捷键”到现在还能用

感兴趣的盆友可以试一试

最早的打字机确实有过

字母按“ABCD”26个字母

顺序排列的时候

顺便还模仿了钢琴的样式

之所以后来不用了

一个是因为,最早的时候

键盘都是机械键盘

但机械水平工艺又不太够

字键回弹的速度跟不上打字员的手速

所以设计师想了个办法

将键盘上常在一起的

THSHTH 尽量分开

给按键回弹时间

另外这个按键是为了符合

当时人们发电报的习惯

首先,因为第二排的ASDFJKL

转录美国摩斯电码最常用的字母

所以被放在了键盘的HOME ROW

不打字时,手停留在键盘上的那一排按键

另外在美国版的摩斯电码中

Z的信号是滴滴滴 滴

S的信号是滴滴滴

E的信号声是 滴

Z和SE傻傻分不清

所以为了方便电报员打错了赶紧改

Z、S、E的位置就被排成一溜

因为后来打字机不卡顿了

也发明了更符合人体力学设定的

德沃夏克键盘

但压根没人用

这两个凸起也是

为了适应QWERT键盘而诞生的

它俩的主要作用就是

帮你盲打的时候精准定位~

大家可以在预备打字的时候

把双手“随意”得放在键盘上

会发现左手的食指大概率放在F

右手的食指大概率放在J

比方说早期的苹果

就把它的方向键

很反人类地安排成了一条直线

让你打森林冰火人都像跳炫舞qq

不过还有这种更抽象的

当然也有像“十”字型分布

这种稍微合理的

但是大家可以在桌子上模拟着按一下

也挺费中指的

天下苦方向键久矣

终于有一个叫DEC的公司

发现把向下键放在左右中间

向上键单独在上面

是最符合人的手指和大脑的运作逻辑的

(⊙o⊙)…

行吧,那今天的科普到此结束

我们下期见

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  1. CONNECT:[ UseTime:0.000488s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000876s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000299s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000290s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000457s ]
  6. SELECT * FROM `set` [ RunTime:0.000227s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000623s ]
  8. SELECT * FROM `article` WHERE `id` = 500205 LIMIT 1 [ RunTime:0.000568s ]
  9. UPDATE `article` SET `lasttime` = 1775380928 WHERE `id` = 500205 [ RunTime:0.002448s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000224s ]
  11. SELECT * FROM `article` WHERE `id` < 500205 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000465s ]
  12. SELECT * FROM `article` WHERE `id` > 500205 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000467s ]
  13. SELECT * FROM `article` WHERE `id` < 500205 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001066s ]
  14. SELECT * FROM `article` WHERE `id` < 500205 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003587s ]
  15. SELECT * FROM `article` WHERE `id` < 500205 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000911s ]
0.088996s