先看一下代碼：function Parent(name){    this.name = "liu";}function Child(age){    this.age = age;}Child.prototype = new Parent();var child1 = new Child(19);alert(child1.name+" "+child1.age);//liu 19Child明明繼承的是Parent的prototype，而name屬性是屬于Parent構(gòu)造函數(shù)的，那為什么Child實(shí)例會(huì)有name屬性呢？