<textarea name="content" id="content" style="width:345px;height:120px;"></textarea><div id="contentwordage"></div>
<script type="text/javascript">
$(document).ready(function(){
var limitNum = 500;
var pattern = \'还可以输入\' + limitNum + \'字符\';
$(\'#contentwordage\').html(pattern);
$(\'#content\').keyup(
function(){
var remain = $(this).val().length;
if(remain > 500){
pattern = "字数超过限制！";
}else{
var result = limitNum - remain;
pattern = \'还可以输入\' + result + \'字符\';
}
$(\'#contentwordage\').html(pattern);
}
);
});</script>
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