Textarea字数的限制

<script language="JavaScript" type="text/javascript">                 var TextUtil = new Object();             TextUtil.NotMax = function(oTextArea){                 var maxText = oTextArea.getAttribute("maxlength");                 if(oTextArea.value.length > maxText){                     oTextArea.value = oTextArea.value.substring(0,maxText);                     alert("超出限制");                 }             } </script> 

 

<textarea style="width:360px" mice-textarea="textarea"

                     onpropertychange="TextUtil.NotMax(this)" maxlength="300"

                                              name="content" id="content1" rows="8" cols="30"></textarea>

(<span style="color:red">*</span>300个字以内)