js做的虚拟键盘
我们在做web开发的时候，有时候需要考虑很高的安全性，比如在线的支付，银行账号的登录等等，都需要用键盘输入一定的内容，而这时候使用虚拟的键盘，则可以提高一定的安全性：
下面是使用虚拟键盘的页面导入的代码：<script type="text/javascript" src="keyboard.js" charset="UTF-8"></script>
<link rel="stylesheet" type="text/css" href="keyboard.css">
<input type="text" value="" class="keyboardInput">这样子就可以随意的添加你想用的虚拟键盘了。而要想使用这个需要有三个东西：
1.keyboard.js

/* ********************************************************************
 **********************************************************************
 * HTML Virtual Keyboard Interface Script - v1.40
 *   Copyright (c) 2010 - GreyWyvern
 *
 *  - Licenced for free distribution under the BSDL
 *          http://www.opensource.org/licenses/bsd-license.php
 *
 * Add a script-driven keyboard interface to text fields, password
 * fields and textareas.
 *
 * See http://www.greywyvern.com/code/javascript/keyboard for examples
 * and usage instructions.
 *
 * Version 1.40 - September 30, 2010
 *   - Fix issue with spaced-out comma keys
 *   - Added a bit more cascade-prevention CSS
 *   - Clear Shift/Alt keys when Caps/AltLk key is pressed
 *   - Fix double-click bugginess in Firefox
 *
 *   See full changelog at:
 *     http://www.greywyvern.com/code/javascript/keyboard.changelog.txt
 *
 * Keyboard Credits
 *   - Dari keyboard layout by Saif Fazel
 *   - Kurdish keyboard layout by Ara Qadir
 *   - Assamese keyboard layout by Kanchan Gogoi
 *   - Bulgarian BDS keyboard layout by Milen Georgiev
 *   - Basic Japanese Hiragana/Katakana keyboard layout by Damjan
 *   - Ukrainian keyboard layout by Dmitry Nikitin
 *   - Macedonian keyboard layout by Damjan Dimitrioski
 *   - Pashto keyboard layout by Ahmad Wali Achakzai (qamosona.com)
 *   - Armenian Eastern and Western keyboard layouts by Hayastan Project (www.hayastan.co.uk)
 *   - Pinyin keyboard layout from a collaboration with Lou Winklemann
 *   - Kazakh keyboard layout by Alex Madyankin
 *   - Danish keyboard layout by Verner Kj忙rsgaard
 *   - Slovak keyboard layout by Daniel Lara (www.learningslovak.com)
 *   - Belarusian, Serbian Cyrillic and Serbian Latin keyboard layouts by Evgeniy Titov
 *   - Bulgarian Phonetic keyboard layout by Samuil Gospodinov
 *   - Swedish keyboard layout by H氓kan Sandberg
 *   - Romanian keyboard layout by Aurel
 *   - Farsi (Persian) keyboard layout by Kaveh Bakhtiyari (www.bakhtiyari.com)
 *   - Burmese keyboard layout by Cetanapa
 *   - Slovenian keyboard layout by Miran Zeljko
 *   - Hungarian keyboard layout by Antal Sall 'Hiromacu'
 *   - Arabic keyboard layout by Srinivas Reddy
 *   - Italian and Spanish (Spain) keyboard layouts by dictionarist.com
 *   - Lithuanian and Russian keyboard layouts by Ramunas
 *   - German keyboard layout by QuHno
 *   - French keyboard layout by Hidden Evil
 *   - Polish Programmers layout by moose
 *   - Turkish keyboard layouts by offcu
 *   - Dutch and US Int'l keyboard layouts by jerone
 *
 */
var VKI_attach, VKI_close;
  function VKI_buildKeyboardInputs() {
    var self = this;

    this.VKI_version = "1.40";
    this.VKI_showVersion = true;
    this.VKI_target = false;
    this.VKI_shift = this.VKI_shiftlock = false;
    this.VKI_altgr = this.VKI_altgrlock = false;
    this.VKI_dead = false;
    this.VKI_deadkeysOn = false;
    this.VKI_kts = this.VKI_kt = "US Int'l";  // Default keyboard layout
    this.VKI_langAdapt = true;  // Use lang attribute of input to select keyboard
    this.VKI_size = 2;  // Default keyboard size (1-5)
    this.VKI_sizeAdj = true;  // Allow user to adjust keyboard size
    this.VKI_clearPasswords = false;  // Clear password fields on focus
    this.VKI_imageURI = "keyboard.png";  // If empty string, use imageless mode
    this.VKI_clickless = 0;  // 0 = disabled, > 0 = delay in ms
    this.VKI_keyCenter = 3;

    this.VKI_isIE = /*@cc_on!@*/false;
    this.VKI_isIE6 = /*@if(@_jscript_version == 5.6)!@end@*/false;
    this.VKI_isIElt8 = /*@if(@_jscr