SOURCE

var student={
    name:"孟春",
    getAge(){
        var age=18;
        console.log(`${this.name}的年纪是：${age}`);
        return this
    },
    getHeight(){
        var height="180cm";
        console.log(`${this.name}的身高是：${height}`);
        return this
    }
}

student.getAge().getHeight()