文本框提示~ 做个备注吧~

<script type="text/javascript"><%--提示输入信息--%>function checkLen(obj) {  var maxChars = 200;<%--最多字符数  --%>if (obj.value.length > maxChars)  obj.value = obj.value.substring(0,maxChars);  var curr = maxChars - obj.value.length;  <%--剩餘  --%>var currs = maxChars - curr;<%--已有字數  --%>document.getElementById("count").innerHTML = curr.toString();document.getElementById("counts").innerHTML = currs.toString();} </script>

文本<textarea onkeyup="checkLen(this)" </textarea>提示 <div ><span id="counts">0</span>/<span id="count">200</span></div>