js 转义

function removeHtmlTab(tab) {
return tab.replace(/<[^<>]+?>/g,'');//删除所有HTML标签
}
function html2Escape(sHtml) {
return sHtml.replace(/[<>&"]/g,function(c){return {'<':'<','>':'>','&':'&','"':'"'}[c];});
}

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];});
}
function nbsp2Space(str) {
var arrEntities = {'nbsp' : ' '};
return str.replace(/&(nbsp);/ig, function(all, t){return arrEntities[t]})
}
function return2Br(str) {
return str.replace(/\r?\n/g,"<br />");
}
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;
}
function mergeSpace(str) {
str=str.replace(/(\s| )+/g,' ');
return str;
}

var str="<script type='text/javascript' >jjj</script>kkk " ;str=str.replace(/</g,'<');
str=str.replace(/>/g,'>');
var reg=/<script[^>]*>(.|\n)*?(?=<\/script>)<\/script>/gi;
alert(str.replace(reg,''));