``` //es6的写法 class Child { constructor() { this.name = name; this.age = age; } } let child = new Child(); ``` ``` //es5的写法 var Person = function(name,age){ this.name = name; this.age = age; this.see = function(){ console.log(this.name+"爱看片") } } var liyao = new Person("liyao",18) liyao.see(); ```