实时统计输入字符数

实时统计输入字符数

 

<script>     var $E = document.getElementById; String.prototype.lenB = function(){     return this.unHtmlReplace().replace(/\*/g," ").replace(/[^\x00-\xff]/g,"**").length; } String.prototype.unHtmlReplace = function () {     var s = (this).replace(/&amp;/g,"&").replace(/&lt;/g,"<").replace(/&gt;/g,">").replace(/&nbsp;/g," ").replace(/&quot;/g,"\"");       return s.replace(/&#(\d{2});/g,function($0,$1) {return unescape("%"+parseInt($1).toString(16));}); }       function onModChange(s, max, o) {      //实时显示输入字数的       if(document.readyState != "complete") {           s = escape(s);           setTimeout('onModChange(unescape("'+ s+ '"),'+ max+ ',$E("'+ o.id+ '"))', 10);           return;       }       var words=s.lenB();       if(words > max)           words = "<font color=red>"+ words+ "</font>";       else           words = "<font color=green>"+ words+ "</font>";       o.innerHTML = "已输入"+ words+ "个字符(最多"+ max+ "个字符)"; } </script> <!--S 发表评论--> <div>     <label><span>发表评论：</span> <textarea name="content" id="cmt_content" cols="50" rows="3" onpropertychange="onModChange(this.value, 150, $E('post_status'))"></textarea>     </label>     <div><em id="post_status">已输入<font color=green>0</font>个字符(最多150个字符)</em></div> </div> 如图所示