ts版本：
class?Animal{
? ? fullStr:string;
? ? constructor(public color,public size,public age){
????????this.fullStr=color+' '+size+' '+age
? ? }
}
let cat=new Animal("red","1KG","2")
js版本
let Animal =( function(){
????????????function Animal(color,size,age){
????????????????this.color=color;
? ? ? ? ? ? ? ? this.size=size;
? ? ? ? ? ? ? ? this.age=age;
? ? ? ? ? ? ? ? this.fullStr=color+' '+size+' '+age;
????????????}
? ? ? ? ? ? ?return?Animal;
}())
let cat=new Animal("red","1KG","2")
