类中添加方法

     class Star {
            constructor(uname, age) {
                this.uname=uname;
                this.age = age;
            }
            sing(song){
                console.log(`${this.uname}的${song}`);
            }
        }
        var ldh = new Star("刘德华", 60);
        var zxy = new Star("张学友", 50);
        console.log(zxy);
        console.log(ldh);
        ldh.sing("我爱你")
        zxy.sing("哈哈哈")

1.类里面所有函数不需要写function
2.多个函数方法之间不需要添加逗号分隔符