通过读取数据库html代码生成页面

def preview
    @ad = Advertisement.find(params[:id])
    @preview_content = @ad.code.gsub(/%%.+?%%/, "")
    # @width = @ad.size.split('*')[0]
    # @height = @ad.size.split('*')[1]
    @width = params[:width]
    @height = params[:height]
    render :partial => "preview_content"
end


<%= @preview_content %>
<script>
var tag = document.getElementsByTagName('img');
if(tag.length > 0){
tag[0].style['width']= '<%=@width%>px';
tag[0].style['height']= '<%=@height%>px';
}
var embed = document.getElementsByTagName('embed');
if(embed.length > 0){
embed[0].style['width']= '<%=@width%>px';
embed[0].style['height']= '<%=@height%>px';
}
</script>
<style type="text/css">
body{
margin:0;
}
</style>