用法
class Star{
constructor(name,age){
this.name=name;
this.age=age;
}
}
Star.prototype.sing=function(){
console.log(this.name+'会唱歌')
}
var ldh=new Star("刘德华",20)
console.log(ldh)
ldh.sing()
标签：Star,name,age,ldh,原型,prototype,构造函数 From： https://www.cnblogs.com/hs20011205/p/17010066.html