js键盘事件

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
window.onload=function(){
    
    oArea=document.getElementById('area');
    oTxt=document.getElementById('txt');
    oBtn=document.getElementById('btn');
    oBtn.onclick=function(){
        oArea.value=oArea.value+oTxt.value+'
';
        oTxt.value=''
    }
    
    oTxt.onkeydown = function(evt){
        var e = evt || event;
        if(e.keyCode == 13 && e.ctrlKey) {
            oArea.value += oTxt.value+"
";
            oTxt.value = "";
        }
    }
}
 
</script>
 
</head>
 
<body>
 
<textarea cols="50" rows="9" id="area"></textarea>
<br/>
<input type="text" id="txt" />
<input type="button" id="btn" value="提交" />
 
</body>
</html>

2.键盘码，键盘输入多少就显示其对应的状态码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- saved from url=(0035)http://fgm.cc/learn/lesson5/03.html -->
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 
<title>用户按下键盘，显示keyCode</title>
<style>
body{
    text-align:center;
    font:30px/1.5 5fae8f6f96c59ed1, arial;    
}
pre{color:green;padding:10px 15px;background:#f0f0f0;border:1px dotted #333;font:12px/1.5 Courier New;text-align:left;}
span{color:#999;}
</style>
<script type="text/javascript">
window.onload = function(){
    var oP = document.getElementsByTagName("p")[0];    
    document.onkeydown = function(evt){
        var e = evt || event; //兼容写法
        oP.innerHTML = e.keyCode;
    }
}
 
</script>
</head>
<body>
 
当前按键的编码<p>70</p>
 
</body></html>