怎么屏蔽键盘的某些按键，例如F1到F12，以及鼠标右键等
怎么在asp.net页面上屏蔽键盘的某些按键，例如F1到F12，以及鼠标右键等？谢谢
[解决办法]
<script LANGUAGE="JavaScript">
function click()
{ if (event.button==2)
{alert('禁用右键'); }
}
document.onmousedown=click
</script>
function window.onhelp(){return false} //屏蔽F1帮助
/*keyCod从113-123分别禁用了F2-F12键,13禁用了回车键(Enter),8禁用了退格键(BackSpace)*/
document.onkeydown = function()
{
if(window.event && window.event.keyCode == 113)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 114)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 115)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 116)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 117)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 118)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 119)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 120)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 121)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 122)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 123)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 13)
{
window.event.keyCode = 505;
}
if(window.event && window.event.keyCode == 8)
{
alert(str+"\n请使用Del键进行字符的删除操作！"); window.event.returnValue=false;
}
if(window.event && window.event.keyCode == 505)
{
alert(str)
window.event.returnValue=false;
}
}