3.3 代码的实现;
总体思路，用keypress事件对象获取按键字符，用keydown事件获取功能字符，如Enter，Backspace等。
代码实现如下所示
复制代码
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD><TITLE>js 按键记录</TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="羽殇仁">
<META NAME="Keywords" CONTENT="js 按键记录">
<META NAME="Description" CONTENT="js 按键 记录">
</HEAD>
<BODY>
<script type="text/javascript">
var keystring = "";//记录按键的字符串
function $(s){return document.getElementById(s)?document.getElementById(s):s;}
function keypress(e)
{
var currKey=0,CapsLock=0,e=e||event;
; currKey=e.keyCode||e.which||e.charCode;
CapsLock=currKey>=65&&currKey<=90;
switch(currKey)
{
; //屏蔽了退格、制表、回车、空格、方向键、删除键
; case 8: case 9:case 13:case 32:case 37:case 38:case 39:case 40:case 46:keyName = "";break;
; default:keyName = String.fromCharCode(currKey); break;
}
keystring += keyName;
}
function keydown(e)
{
var e=e||event;
var currKey=e.keyCode||e.which||e.charCode;
if((currKey>7&&currKey<14)||(currKey>31&&currKey<47))
{
; switch(currKey)
; {
; case 8: keyName = "[退格]"break;
; case 9: keyName = "[制表]"break;
; case 13:keyName = "[回车]"break;
; case 32:keyName = "[空格]"break;
; case 33:keyName = "[PageUp]" break;
; case 34:keyName = "[PageDown]" break;
; case 35:keyName = "[End]" break;
; case 36:keyName = "[Home]" break;
; case 37:keyName = "[方向键左]" break;
; case 38:keyName = "[方向键上]" break;
; case 39:keyName = "[方向键右]" break;
; ; case 40:keyName = "[方向键下]" break;
; case 46:keyName = "[删除]" break;
; default:keyName = "" ;break;
; }
; keystring += keyName;
}
$("content").innerHTML=keystring;
}
function keyup(e)
{
$("content").innerHTML=keystring;
}
document.onkeypress=keypress;
document.onkeydown =keydown;
document.onkeyup =keyup;
</script>
<input type="text" />
<input type="button" value="清空记录" onclick="$('content').innerHTML = '';keystring = '';"/>
<br/>请按下任意键查看键盘响应键值：<span id="content"></span>
</BODY>
</HTML>
