1.1. 1.3 title

@data3：P104-105

<% provide(:title, "Home") %>

# 根据所在的页面返回完整的标题 
def full_title(page_title = '')
  base_title = "Ruby on Rails Tutorial Sample App" 
  if page_title.empty?
    base_title
  else
    page_title + " | " + base_title 
  end
end

<title><%= full_title(yield(:title)) %></title>