html:
<INPUT name=lbl_limit style="font-size:12px;color:Blue;BORDER-TOP-STYLE: none; BORDER-RIGHT-STYLE: none; BORDER-LEFT-STYLE: none; BACKGROUND-COLOR: #ffffff; BORDER-BOTTOM-STYLE: none" size="48" >
JS:
function checkMemoSize(){
document.form1.lbl_limit.value="最多支持500汉字;已输入字数:" + document.getElementById("txtMemo").value.length;
if (document.getElementById("txtMemo").value.length>500){
document.getElementById("txtMemo").value.length=document.getElementById("txtMemo").value.substring(0,500);
}
}
调用:
<script language="javascript">
setInterval("checkMemoSize()", 100);
</script>