<script language="JavaScript">
<!--
var s = "sdSfs"
if(s.toLowerCase()!=s)
{
alert('有大写字母');
}
//-->
</script>
<!--
var s = "sdSfs"
if(s.toLowerCase()!=s)
{
alert('有大写字母');
}
//-->
</script>
<!--
var s= "SDsF";if(s.length>0&&/^[A-Z]*$/.test(s))
{
alert('全是大写');
}
//-->
</script>
{
var patrn=/^[a-zA-Z]{1,30}$/;
if (!patrn.exec(s)) {
return false
}
return true
} 后面1,30是限制长度的!
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<script>
function check_letter(str){
var re=/[A-Z]/
if(re.test(str))
alert("含有大写字母");
}
</script>
</HEAD><BODY>
<input type=text name=text1>
<input type=button value="测试" onclick="check_letter(document.all.text1.value)">
</BODY>
</HTML>
大写<input type=text style="text-transform:uppercase;" onblur="this.value=this.value.toUpperCase();" >
</BODY>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<script>
function check_letter(str){
var count=0;
var i=str.length
var count=0;
for(i=0;i<str.length;i++){
substr=str.substring(i,i+1);
var re=/[A-Z]/
if(re.test(substr))
count++;
}
if(count==i){
alert("全部是大写字母");
}
}
</script>
</HEAD><BODY>
<input type=text name=text1>
<input type=button value="测试" onclick="check_letter(document.all.text1.value)">
</BODY>
</HTML>
今天是重阳节哦
大家节日快乐!