目录
block
可以用在闭包里
irb(main):067:1* def test ()
irb(main):068:1* x=1
irb(main):069:2* return lambda do
irb(main):070:2* x+=1
irb(main):071:2* puts x
irb(main):072:1* end
irb(main):073:0> end
=> :test
irb(main):074:0> fun.call
1
=> nil
irb(main):075:0> fun.call
2
=> nil
irb(main):076:0>