js 去除内链 html 检测 网址

var $ = function(f){return document.getElementById(f);} function check_con(){          var f= "content"; //需要检测的内容             var kw;          var mess = $(f).value.replace(/<[^>]+>/g,"");//去掉所有的html标记;          var clearhtml =/<(?:.|s)*?>| /g;//去掉所有的html标记和            mess = html.replace(/<[^>]+>/g,"");//去掉所有的html标记;          mess = mess.replace(/(^\s+)|(\s+$)/g,"");//去掉前后空格          mess = mess.replace(/\s/g,"");//去除文章中间空格          mess = mess .replace(clearhtml,'');      for(var i=0;i<mess.length;i++){        kw = mess[i].toLowerCase();        if(kw =='h'){ var http = kw+mess[i+1]+mess[i+2]+mess[i+3];if(http.toLowerCase() == 'http'){alert('存在网址');return false;}}        if(kw =='.'){          var url = mess[i+1]+mess[i+2]+mess[i+3]; var surl = mess[i+1]+mess[i+2]; var tourl = mess[i+1]+mess[i+2]+mess[i+3]+mess[i+4];          url = url.toLowerCase();surl =surl.toLowerCase();tourl =tourl.toLowerCase();          if(url == 'com'|| url=='net' || url=='org'|| surl == 'cn' ||surl=='cc' || tourl=='info'  || tourl=='name' || surl=='uk') alert('存在网址');return false;}        if(kw == 'q' && mess[i+1].toLowerCase()=='q' || mess[i+1].toLowerCase()==':'){alert('存在QQ');return false;}        if(kw == '@' && mess[i+1].toLowerCase()=='q'){alert('存在邮箱');return false;}       }    }