自定义装饰器

const cacheMap = new Map()
function enableCache(target, name, descriptor){
    const val = descriptor.value;
    descriptor.value = async function(...args) {
        const cacheKey = name + JSON.stringify(args);
        if(!cacheMap.get(cacheKey)) {
            const cacheValue = Promise.resolve(val.apply(this, args)).catch(_ => {
                cacheMap.set(cacheKey, null);
            })
            cacheMap.set(cacheKey, cacheValue)
        }
        return cacheMap.get(cacheKey)
    }
    return descriptor
}
class PromiseClass {

    @enableCache
    static async getInfo() {}
}