例子:
json = '["a", "B", "C"]'
puts "Unsafe #{unsafe_json(json).inspect}" #输出Unsafe ["a", "B", "C"]
把上面的json字符串解析成Array。这样的方法并不安全,比如:json = 'puts "Danger Will Robinson"'
puts "Unsafe #{unsafe_json(json).inspect}"![]()
又该输出什么呢?很遗憾,解析不出什么东西,跳出一个警告:
warning: character class has `[' without escape
安全的方法如下:module SafeJSON
require 'monitor'
def SafeJSON.build_safe_json
ret = nil
waiter = ''
waiter.extend(MonitorMixin)
wait_cond = waiter.new_cond
![]()
Thread.start do
$SAFE = 4
end
包含这个Module,你就可以这样使用:peoples=SafeJSON.parse('{"peoples":[{"name":"site120","email":"site120@163.com","sex":"男"},{"name":"site120_2","email":"site120@163.com_2","sex":"男_2"}]}')
puts peoples["peoples"][1]["name"] #输出site120_2
rails通过RJS内置了对AJAX的支持,也许用到json的机会并不多,不过作为一种数据交换的方便格式,还是值的注意。