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function d(){this.get=function(){return this.getName()}};
d.prototype.getName=function(){return 3;};
var d = new d();
console.log(d.get());//undefined

function d(){this.get=function(){return this.getNum()}};

你說呢

function d(){this.get=function(){return this.getName();}};
d.prototype.getName=function(){return 3;};
var d = new d();
console.log(d.get());

自己對比下

num name

this.getnum改成this.getname

function d(){
            this.get= function(){
                return this.getName()
            }
        };
        d.prototype.getName = function(){
            return 3;
        };
        var d = new d();
        console.log(d.get());