一个分页效果ruby版可作为面试题吧

最终的代码

#coding:utf-8

total_pages=11

current_page=10

a=(1..total_pages).to_a

  #<div class="page_box"><span><font>&laquo;首页</font></span><span><font>&#173;上一页</font></span>

#<span id="page_on"><font>1</font></span>

#<span><a href="" >2</a></span>

#<span><a href="" >3</a></span>

#<span><a href="" >4</a></span>

#<span><a href="" >5</a></span>

#<span><a href="" >...</a></span>

#<span><a href="" >11</a></span>

#<span><a href="">&#173;下一页</a></span>

#<span><a href="" >&#173;尾页&raquo;</a></span>

#<span><font>1/共11页</font></span>

#</div>

#r=[]

#if current_page-5>0

#  r<<"1"

#  r<<"..."+(current_page-3).to_s

#  r<<current_page-2

#  r<<current_page-1

#  r<<current_page

#  if current_page+1<=total_pages

#    r<<current_page+1

#  end

#  if current_page+2<==total_pages

#    r<<current_page+2

#  end

#else

#  r.concat((1...current_page).to_a)

#end

#r<<current_page

#if current_page+5<=total_pages

#  r<<current_page+1

#  r<<current_page+2

#  r<<"..."+(current_page+3).to_s

#else

#  r.concat(((current_page+1)..total_pages).to_a)

#end

#

#

#

#puts r

#r=[]

#r<<current_page

#if current_page-2>0

#  r.unshift current_page-1

#  

#end

#if current_page-5>0 and current_page+2<=total_pages

#  a[1..

#end

#puts a

if total_pages>6

  if current_page-5>0

    if current_page+2<=total_pages

      a.delete_if{|x| x< current_page-2}

    elsif current_page+1<=total_pages

      a.delete_if{|x| x<current_page-3}

    elsif current_page<=total_pages

      a.delete_if{|x| x<current_page-4}

    end

  end

  if current_page+5>0

    if current_page-2>0

      a.delete_if{|x| x >current_page+2}

    elsif current_page-1>0

      a.delete_if{|x| x>current_page+3}

    elsif current_page>0

      a.delete_if{|x| x>current_page+4}

    end

  end

end

if a.first!=1

  a.unshift "..."

  a.unshift 1

end

if a.last!=total_pages

  a<<"..."

  a<<total_pages

end

puts a

puts "----------"

pos=a.index(current_page)

def gen_link(page)

  page=page.to_s

  #拼接样式输出

  %Q{<span><a href="">#{page}</a></span>}

end

r=[]

a.each_with_index do |elem,index|

  page=elem

  if elem=="..." and index<pos

    page=a[a.index("...")+1]-1

  end

  if elem=="..." and index>pos

    page=a[a.rindex("...")-1]+1

  end

  r<<gen_link(page)

end

#修改当前页的样式

r[pos]=%Q{<span id="page_on"><font>#{a[pos]}</font></span>}

if current_page==1

  r.unshift %q{<span><font>&#173;上一页</font></span>}

  r.unshift %q{<span><font>&laquo;首页</font></span>}

  r.unshift %q{<div class="page_box">}

else

  page=current_page-1

  r.unshift %Q{<span><a href="">上一页</a></span>}

  r.unshift %Q{<span><a href="">首页</a></span>}

  r.unshift %q{<div class="page_box">}

end

if current_page==total_pages

  r<<%q{<span><a href="">&#173;下一页</a></span>}

  r<<%q{<span><a href="" >&#173;尾页&raquo;</a></span>}

  r<<%q{<span><font>1/共11页</font></span>}

  r<<%q{</div>}

else

  page=current_page+1

  r<< %Q{<span><a href="">&#173;下一页</a></span>}

  r<< %Q{<span><a href="">&#173;尾页&raquo;</a></span>}

  r<<%q{</div>}

end

puts r

puts r.join("")