我想将具有属性(键)的对象映射到装饰器(值)。如果可能的话,我想使用弱 map 。我有一个使用字符串的解决方案,这很好,只是弱映射不接受字符串作为键。这可以通过 Map 或 WeakMap 实现吗?
'use strict';
class Accordion {
constructor() {}
}
let Decorators = new Map();
Decorators.set({nodeName: 'tag-name-here', component: 'accordion'}, (client) => { return new Accordion(client) });
class Client {
constructor() {
let key = {nodeName: 'tag-name-here', component: 'accordion'}
let decorator;
if (Decorators.has(key)) {
decorator = Decorators.get(key)(this);
}
console.log(decorator); //undefined, unless I use a string as a key.
}
}
new Client();
最佳答案
它不起作用,因为 key: {nodeName: 'tag-name-here', component: 'accordion'}
的不同实例每次都会映射到新的内存位置,所以你赢了这样无法得到你想要的值。为了使其工作,您必须将其设置为一个新变量,以便您的代码如下所示:
'use strict';
class Accordion {
constructor() {}
}
let Decorators = new Map();
const key = {nodeName: 'tag-name-here', component: 'accordion'};
Decorators.set(key, (client) => { return new Accordion(client) });
class Client {
constructor() {
let decorator;
if (Decorators.has(key)) {
decorator = Decorators.get(key)(this);
}
console.log(decorator); // this should return an object
}
}
new Client();
关于javascript - ES6 将对象映射到装饰器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44249948/