本文实例讲述了JS实现自定义简单网页软键盘效果。分享给大家供大家参考，具体如下：
这是一款自定义的简单点的网页软键盘，没有使用任何控件，仅是为了练习JavaScript编写水平，安全性方面没有过多考虑，有顾虑的可以不用，目的是学习，希望对您有用处。
运行效果截图如下：
在线演示地址如下：
http://demo.maopiaopiao.com/js/2015/js-simple-web-keybord-style-codes/
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>自写一个简单点的网页软键盘</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<style>
* {
padding:0;
margin:0;
}
body {
background:#fff;
}
th, td {
border:1px solid #ccc;
padding:2px 0;
text-align:center;
}
td {
cursor:pointer
}
div {
border:1px solid #999;
float:left;
padding:1px;
display:none;
}
.num {
color:blue;
}
</style>
<script>
var htmlCode = {
"&" : "&",
'"' : """,
"<" : "<",
">" : ">",
}
function test(){
var input = document.getElementById("input");
var e = window.event || test.caller.arguments[0];
var el = e.target || e.srcElement;
if(el.tagName.toLowerCase() == "td" && el.rowSpan <= 1 && el.colSpan <= 1 ){
var str = el.innerHTML;
str = htmlCode[str] || str;
input.value += str;
}
if(el.innerHTML == "退格"){
input.value = input.value.slice(0,-1);
}
if(el.innerHTML == "切换大/小写"){
var els = document.getElementsByTagName("td");
for(var i = 0, l = els.length; i < l; i++){
var str = els[i].innerHTML;
if(/^[a-z]$/.test(str))
els[i].innerHTML = str.toUpperCase();
if(/^[A-Z]$/.test(str))
els[i].innerHTML = str.toLowerCase();
}
}
if(el.innerHTML == "ENTER"){
ctrKeyboard();
}
}
function ctrKeyboard(){
var el = document.getElementById("keyboard");
if(el.offsetWidth > 0)
el.style.display = "none";
else {
el.style.display = "block";
sortNum();
capsInit();
}
}
function capsInit(){
var els = document.getElementsByTagName("td");
for(var i = 0,j = 0, l = els.length; i < l; i++){
var str = els[i].innerHTML;
if(/^[A-Z]$/.test(str))
els[i].innerHTML = str.toLowerCase();
}
}
function sortNum (){
var arr = [0,1,2,3,4,5,6,7,8,9].sort(function(){
return Math.random() > 0.5?1:-1;
});
var els = document.getElementsByTagName("td");
for(var i = 0,j = 0, l = els.length; i < l; i++){
var str = els[i].innerHTML;
if(/^d$/.test(str))
els[i].innerHTML = arr[j++];
}
}
</script>
</head>
<body>
<input id="input" readonly="readonly"/><input type="button" value="打开/关闭 键盘" onclick="ctrKeyboard()"/>
<br>
<br>
<div id="keyboard">
<table cellspacing="1" width="480" onclick="test()">
<tr>
<th colspan="16">键盘模拟输入密码器</th>
</tr>
<tr>
<td>~</td>
<td>!</td>
<td>@</td>
<td>#</td>
<td>$</td>
<td>%</td>
<td>^</td>
<td>&</td>
<td>*</td>
<td>(</td>
<td>)</td>
<td>_</td>
<td>+</td>
<td>|</td>
<td rowspan="2" width="120">退格</td>
</tr>
<tr>
<td>`</td>
<td class="num">1</td>
<td class="num">2</td>
<td class="num">3</td>
<td class="num">4</td>
<td class="num">5</td>
<td class="num">6</td>
<td class="num">7</td>
<td class="num">8</td>
<td class="num">9</td>
<td class="num">0</td>
<td>-</td>
<td>=</td>
<td></td>
</tr>
<tr>
<td>q</td>
<td>w</td>
<td>e</td>
<td>r</td>
<td>t</td>
<td>y</td>
<td>u</td>
<td>i</td>
<td>o</td>
<td>p</td>
<td>{</td>
<td>}</td>
<td>[</td>
<td>]</td>
<td colspan="2">切换大/小写</td>
</tr>
<tr>
<td>a</td>
<td>s</td>
<td>d</td>
<td>f</td>
<td>g</td>
<td>h</td>
<td>j</td>
<td>k</td>
<td>l</td>
<td>:</td>
<td>"</td>
<td>;</td>
<td>'</td>
<td colspan="3" rowspan="3">ENTER</td>
</tr>
<tr>
<td>z</td>
<td>x</td>
<td>c</td>
<td>v</td>
<td>b</td>
<td>n</td>
<td>m</td>
<td><</td>
<td>></td>
<td>?</td>
<td>,</td>
<td>.</td>
<td>/</td>
</tr>
</table>
</div>
</body>
</html>
希望本文所述对大家JavaScript程序设计有所帮助。