关于闭包的几个思考题，值得回味！

<script>

        // 闭包 计算打车价格

        //打车起步价13（3公里内），之后每多一公里增加5块钱，用户输入公里数就可以计算打车价格

        //如果有拥堵情况，总价格多收取10块钱的拥堵费

        var car = (function(){

            var start = 13; //起步价

            var total = 0; //总价

            return{

                price:function(n){

                    if(n <= 3){

                        total = start;

                    }else{

                        total = start + (n-3) *5

                    }

                    return total;

                }, //正常价格

                traffic:function(flag){

                   return flag ? total + 10 : total;

                } //拥堵价格

            }

        })();

        console.log(car.traffic(false));

        

        console.log(car.price(5)); //23

        console.log(car.traffic(true)); //33

        

        console.log(car.price(1)); //13

        console.log(car.traffic(false)); //13

        

        

二： 两个思考题 和解析

        var name = 'The window';

        var obj = {

            name : 'myobject',

            getNameFun:function(){

                return function(){

                    return this.name;

                }

            }

        }

        console.log(obj.getNameFun()()); //The window

        //  等价于 

        // var f = obj.getNameFun()

        // var f = function(){

        //     return this.name

        // }

        // f() = function(){return this.name}()  //解析为了立即执行函数，this指向window  所以返回了 The window   无闭包

        var name = 'The window';

        var obj = {

            name : 'myobject',

            getNameFun:function(){

                var that = this;

                return function(){

                    return that.name;

                }

            }

        }

        console.log(obj.getNameFun()()); //打印myobject  有闭包

        //分析： var f = obj.getNameFun()

        // var that = this;

        //var f = function(){

         //   return that.name;

        //}

    </script>