<input id="myText" type="text" title="pls input" onKeyUp="foo()">
<script>
var len = 0;
function foo(){
if(len != myText.value.length)
{
alert("Changed!!!");
len = myText.value.length;
}
}
</script>
<script>
var len = 0;
function foo(){
if(len != myText.value.length)
{
alert("Changed!!!");
len = myText.value.length;
}
}
</script>
<HEAD>
<SCRIPT language=JavaScript>
function strlength(str){
var l=str.length;
var n=l
for (var i=0;i<l;i++)
{
if (str.charCodeAt(i)<0||str.charCodeAt(i)>255) n++
}
return n
}
function changebyte(value,length){
var l=strlength(value)
if (l<=length) {
if (document.all!=null) document.all("byte").innerText="还可以输入"+(length-l)+"字节"
}
else
{
alert('输入字节数超出范围');
document.all("byte").innerText="输入字节数超出范围"
return false;
}
return true
}
</SCRIPT>
</HEAD>
<BODY>
<FORM name=test onsubmit="return checkdata()" action="" method=post>
<TEXTAREA onkeydown="return changebyte(document.test.icqcontent.value,20)" onkeyup="return changebyte(document.test.icqcontent.value,20)" name=icqcontent rows=3 cols=40>
</TEXTAREA>
<SPAN id=byte style="font-size:12px">
<SCRIPT language=JavaScript>
changebyte1(document.test.icqcontent.value,20);
</SCRIPT>
</SPAN></FORM></BODY></HTML>