SOURCE

var person={
  fullName:function(city,country){
    console.log(this.firstName+" "+this.lastName+","+city+","+country);
    return this.firstName+" "+this.lastName+" ，"+city+","+country;
  }
};

var person1={
  firstName:'liu',
  lastName:'jason'
};

person.fullName.apply(person1,['jiangsu','china']);

<!--方法复用: 下面的例子中person1对象没有fullName方法，通过apply可以在person1对象上使用fullName方法-->