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