最佳答案
<script>
function checkCharCount(textfield){
if(textfield.value.length > 300) textfield.value = textfield.value.substr(0,300);
document.getElementById("charCounter").innerHTML = 300 - textfield.value.length;
}
</script>
<textarea class="input" name="REMARK" rows="5" cols="45" maxlength="300" wrap="virtual" onKeyUp="checkCharCount(this);"></textarea>
<div><span id="charCounter">300</span> characters left.</div>
