class A
    attr_accessor :var_a
    def initialize(a="a", b="b")
        puts "==initialize=="
        @var_a = a
        @var_b = b
        puts "var_a=#{var_a}"
        puts "@var_a=#{@var_a}"
        #puts "var_b=#{var_b}"#Error
        puts "@var_b=#{@var_b}"
    end

    def modify(a="modify_a", b="modify_b")
        puts "==modify=="
        var_a = a
        var_b = b
        puts "var_a=#{var_a}"
        puts "@var_a=#{@var_a}"
        puts "var_b=#{var_b}"
        puts "@var_b=#{@var_b}"
    end

    def out()
        puts "@var_a=#{@var_a}"
        puts "@var_b=#{@var_b}"
    end

    def modify_x(a="modify_a_x", b="modify_b_x")
        @var_a = a
        @var_b = b
        puts "var_a=#{var_a}"
        puts "@var_a=#{@var_a}"
        #puts "var_b=#{var_b}"#Error
        puts "@var_b=#{@var_b}"
    end


end

test = A.new()
puts "[main]A.var_a=#{test.var_a}"

puts "\n\n\n"
test.modify()
puts "[main]A.var_a=#{test.var_a}"

puts "\n\n\n"
test.var_a = "out_modify_a"
test.out
puts "[main]A.var_a=#{test.var_a}"

puts "\n\n\n"
test.modify_x
puts "[main]A.var_a=#{test.var_a}"

结果如下：

==initialize==
var_a=a
@var_a=a
@var_b=b
[main]A.var_a=a



==modify==
var_a=modify_a
@var_a=a
var_b=modify_b
@var_b=b
[main]A.var_a=a



@var_a=out_modify_a
@var_b=b
[main]A.var_a=out_modify_a



var_a=modify_a_x
@var_a=modify_a_x
@var_b=modify_b_x
[main]A.var_a=modify_a_x

谁能解释下 modify 函数中 var_a 修改了，@var_a没有修改 modify_x 函数中@var_a修改了，var_a 也修改了

欢聚话说：attr_accessor，再类内部能 get，不能 set 而对于对象，既可以 get，也能 set 我的理解有问题没？