78-对象增删改查

增加属性

    class Person{}
    let p = new Person();

    // p.name = "lnj";
    // console.log(p);  // lnj
    p["name"] = "zs";
    console.log(p);  // zs

增加方法

    class Person{}
    let p = new Person();

    // p.say = function(){
    //    console.log("hello world");
    // }
    // console.log(p);
    p["say"] = function(){
        console.log("hello world");
    }
    console.log(p);

删除属性

    class Person{
        name = "lnj";
    }
    let p = new Person();

    // delete p.name;
    // console.log(p);  // {}
    delete p["name"];
    console.log(p);  // {}

删除方法

    class Person{
        say = function {
          console.log("hello world");
        }
    }
    let p = new Person();

    // delete p.say;
    // console.log(p);  // {}
    delete p["say"];
    console.log(p);  // {}

修改属性

    class Person{
        name = "lnj";
    }
    let p = new Person();

    // p.name = "zs";
    // console.log(p.name);  // zs
    p["name"] = "ww";
    console.log(p.name);  // ww

修改方法

    class Person{
        say = function {
          console.log("hello world");
        }
    }
    let p = new Person();

    // p.say = function(){
    //     console.log("hi");
    // }
    // p.say();  // hi
    p["say"] = function(){
        console.log("hi");
    }
    p.say();  // hi

查询属性

    class Person{
        name = "lnj";
    }
    let p = new Person();

    console.log(p.name);  // lnj
    console.log(p["name"]);  // lnj

查询方法

    class Person{
        say = function {
          console.log("hello world");
        }
    }
    let p = new Person();

    p.say();  // hello world