<script language="Javascript">
//屏蔽鼠标右键、Ctrl+N、Shift+F10、F5刷新、退格键
//屏蔽F1帮助
function window.onhelp()
{
return false
}
function KeyDown()
{
//alert(event.keyCode);
//屏蔽 Alt+ 方向键 ← 屏蔽 Alt+ 方向键 →
if ((window.event.altKey)&&((window.event.keyCode==37)||(window.event.keyCode==39)))
{
//alert("不准你使用ALT+方向键前进或后退网页！");
event.returnValue=false;
}
//屏蔽退格删除键,屏蔽 F5 刷新键,Ctrl + R
if ((event.keyCode==116)||(event.ctrlKey && event.keyCode==82))
{
event.keyCode=0;
event.returnValue=false;
} //屏蔽 Ctrl+n
if ((event.ctrlKey)&&(event.keyCode==78))
{
event.returnValue=false;
} //屏蔽 shift+F10
if ((event.shiftKey)&&(event.keyCode==121))
{
event.returnValue=false;
} //屏蔽 shift 加鼠标左键新开一网页
if (window.event.srcElement.tagName == "A" && window.event.shiftKey)
{
window.event.returnValue = false;
} //屏蔽Alt+F4
if ((window.event.altKey)&&(window.event.keyCode==115))
{
window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
return false;
} //屏蔽Ctrl+A
if((event.ctrlKey)&&(event.keyCode==65))
{
return false;
}
return false;
}
document.onkeydown=KeyDown;
</script>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<noscript><meta http-equiv="refresh" content="0;url=about:noscript"></noscript>
<title>屏蔽鼠标右键、Ctrl+N、Shift+F10、Alt+F4、F11、F5刷新、退格键</title>
</head>
<body><script language="Javascript"><!--
//屏蔽鼠标右键、Ctrl+N、Ctrl+R、Shift+F10、F11、F1、F5、退格键
//Author: meizz(梅花雨) 2002-6-18document.oncontextmenu = function() //屏蔽鼠标右键
{
event.returnValue=false;
}function window.onhelp() //屏蔽F1帮助
{
return false;
}document.onkeydown = function()
{
var k = window.event.keyCode;
if (k == 8 || //屏蔽退格删除键
k == 116) //屏蔽 F5 刷新键
{
window.event.keyCode = 0;
window.event.returnValue= false;
}
if (k==122) //屏蔽F11
{
window.event.keyCode = 0;
window.event.returnValue= false;
}
if (window.event.ctrlKey && k == 82) //Ctrl + R
window.event.returnValue= false;
if (window.event.ctrlKey && k == 78) //屏蔽 Ctrl+n
window.event.returnValue= false;
if (event.shiftKey && k==121) //屏蔽 shift+F10
window.event.returnValue= false;
if (window.event.srcElement.tagName == "A" && window.event.shiftKey)
window.event.returnValue = false; //屏蔽 shift 加鼠标左键新开一网页
if (window.event.altKey && k == 115) //屏蔽Alt+F4
{
window.showModelessDialog("about:blank","","dialogWidth:1px;dialogheight:1px");
return false;
}
if (window.event.altKey &&
(k == 37 || //屏蔽 Alt+ 方向键 ←
k == 39)) //屏蔽 Alt+ 方向键 →
{
alert("不准你使用ALT+方向键前进或后退网页！");
event.returnValue=false;
}
/* 注：这还不是真正地屏蔽 Alt+ 方向键，
因为 Alt+ 方向键弹出警告框时，按住 Alt 键不放，
用鼠标点掉警告框，这种屏蔽方法就失效了。以后若
有哪位高手有真正屏蔽 Alt 键的方法，请告知。*/}
// --></script>
<h2 align=center>屏蔽鼠标右键、Ctrl+n、shift+F10、Alt+F4、F11、F5刷新、退格键</h2>
</body>
</html>
你把事件换成onKeyPress，返回
window.event.keyCode = 0;
window.event.returnValue= false;
看能不能屏蔽alt.