 
 test4 =->
     # 没法在 =-> 方法中调用 @方法
+    # 在callback 里调用方法需要用 =>
     class OOO
         constructor:(@name)->
         ask:->

            
    v = new OOO('vvv')
    v.ask2()
    
test4()

            log "test"
        ask2:->
            log "ask2"
            setTimeout =>
                @ask()
            ,500
            # test2()
        test2 = ->
            log "test2"
