//---------小写转大写-------------------
function btnpress()
{ if (event.keyCode >=97 && event.keyCode <=122)
event.keyCode =event.keyCode - 32;}
//-----------只输入数字 ----------
function num(){
if(event.keyCode<48 && event.keyCode>57)
event.keyCode="";
}
function btnpress()
{ if (event.keyCode >=97 && event.keyCode <=122)
event.keyCode =event.keyCode - 32;}
//-----------只输入数字 ----------
function num(){
if(event.keyCode<48 && event.keyCode>57)
event.keyCode="";
}
function btnpress1()//-----------只输入数字 ----------
{
if (event.keyCode >57 || event.keyCode <48)
event.keyCode ="0";
}
<head>
<script language="JavaScript">
<!--
function abc(theinput){
theinput.value = theinput.value.toUpperCase();
}
//-->
</script>
</head><body>
<input type="text" name="t1" onchange="abc(this)">
</body>
</html>
2.
<html>
<head>
<script language="JavaScript">
<!--
function abc(theinput){
theinput.value = theinput.value.replace(/[a-z]*/gi, ""); if (theinput.value.length > 5){
theinput.value = theinput.value.substr(0, 5);
}
}
//-->
</script>
</head><body>
<input type="text" name="t1" onchange="abc(this)">
</body>
</html>