javascript - 更改 javascript 属性给出修改规则

Question

我的类结构如下:

class Player {
    constructor(id) { 
       this.limits.playaces = 1;
       this.actions.playaces = 0;
    }
}

我想应用一个修改函数，让它看起来像这样

var player = new Player();
player.modifyAction("playaces","++"); //increments playaces from actions
player.modifyAction("playaces","--"); //decrements playaces from actions
player.modifyAction("playaces","+4"); //adds 4 to playaces from actions
player.modifyAction("playaces","-1"); //subtract 1 from playaces from actions

我想避免制作 map ，所以我认为 eval() 是最好的行动方案，但我想知道我是否可以使用词法分析器/解析器而不是使用 eval 并转移到新的对象范例，保持类定义尽可能短。

可以吗？

Answer 1

你在找这样的东西吗？

class Player {
    constructor(id) { 
        this.id = id 
        this.playaces = 1;
    }
    incrementPlayaces() {
        this.playaces++
        console.log(this.playaces)
    }
    decrementPlayaces() {
        this.playaces--
        console.log(this.playaces)
    }
    addPlayaces(val) {
        this.playaces += val
        console.log(this.playaces)
    }
}

let player = new Player('id');

player.incrementPlayaces()
player.decrementPlayaces()
player.addPlayaces(-4)
player.addPlayaces(+5)