var test = (function () {    var name = 'lyl'    var age = '18'    return{        getname: function (){            return name        },        getage: function(){            return age        }    }   })();   console.log(test.getname())   console.log(test.getage())

var test = (function () {    var name = 'lyl'    var age = 18        function myadd (){            age=age+1        }    return{        getname: function (){            return name        },        getage: function(){            return age        },        addage: function(){            myadd()        }    }   })();   console.log(test.getname())   console.log(test.getage())   test.addage()   test.addage()   test.addage()   test.addage()   console.log(test.getage())

https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Closures