/*StateMachine*/      var StateMachine = (function(){        function StateMachine(opts){          this.current = opts.initial||‘none‘          this.events = opts.events||[]          for(var i=0,length=this.events.length;i<length;i++){            var self = this            var evt = self.events[i]                        self[evt.name] = function (self,evt){              return function(){                if(typeof self.onchanging === ‘function‘){                  self.onchanging(evt)                  console.log(‘trace->onchanging‘)                }                if(self.is(evt.from)){                  self.current = evt.to                  if(typeof self.onchanged === ‘function‘){                    self.onchanged()                    console.log(‘trace->onchanged‘)                  }                  console.log(evt.name+‘->transition from ‘+evt.from+‘ to ‘+evt.to)                }              }            }(self,evt)          }        }        StateMachine.prototype = {          is: function (s){            return this.current===s          },          can: function (e){            var _events = this.events            var _event            for(var i=0,length=_events.length;i<length;i++){              _event = _events[i]              if(_event.from===this.current&&_event.name===e){                return true              }            }            return false          }        }        return {                    create: function (opts){            var fsm = new StateMachine(opts)            return fsm          }        }      })()