//去掉html标签function removeHtmlTab(tab) { return tab.replace(/<[^<>]+?>/g,'');//删除所有HTML标签}//普通字符转换成转意符function html2Escape(sHtml) { return sHtml.replace(/[<>&"]/g,function(c){
   return {'<':'<','>':'>','&':'&','"':'"'}[c];});}//转意符换成普通字符function escape2Html(str) { var arrEntities={'lt':'<','gt':'>','nbsp':' ','amp':'&','quot':'"'}; return str.replace(/&(lt|gt|nbsp|amp|quot);/ig,function(all,t){
   return arrEntities[t];});}//  转成空格function nbsp2Space(str) { var arrEntities = {'nbsp' : ' '}; return str.replace(/&(nbsp);/ig, function(all, t){
   return arrEntities[t]})}//回车转为br标签function return2Br(str) { return str.replace(/\r?\n/g,"
");}//去除开头结尾换行,并将连续3次以上换行转换成2次换行function trimBr(str) { str=str.replace(/((\s| )*\r?\n){3,}/g,"\r\n\r\n");//限制最多2次换行 str=str.replace(/^((\s| )*\r?\n)+/g,'');//清除开头换行 str=str.replace(/((\s| )*\r?\n)+$/g,'');//清除结尾换行 return str;}// 将多个连续空格合并成一个空格function mergeSpace(str) { str=str.replace(/(\s| )+/g,' '); return str;}