<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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原文：http://www.cnblogs.com/sky-yu/p/6217855.html