Ruby Raise rescue

ruby1.9以上，retry只能支持在rescue里面使用，不支持在block里面用；你要去用ruby1.8

rescue使用代码例子

# -*- coding: UTF-8 -*-
n = 0
begin
  puts 'Trying to do something'
  raise 'oops:' + n.to_s
rescue => ex
  puts ex.message + "!!!!!!"
  n += 1
  retry if n < 3
end
puts "Ok, I give up"

Trying to do something
oops:0!!!!!!
Trying to do something
oops:1!!!!!!
Trying to do something
oops:2!!!!!!
Ok, I give up