javascript - 如何使用 node.js 从 json 引用 key

Question

我将如何访问以下 json 数据

"users":{
    "2211392761":{"username":"user1"},
    "14300995184":{"username":"user2"},
    "2781554712":{"username":"user3"},
    "3554341":{"username":"user4"},
    "202611":{"username":"user5"},
    "17754300653761":{"username":"user6"}
}

到目前为止我有这个，我知道这是完全错误的:

Object.keys(jsonevents["events"]).forEach(function(key) {
    if(eventName == jsonevents["events"][key]["name"]){
        if(jsonevents["events"][key]["users"]){
            if(jsonevents['events'][key]["users"][message.author.id]){
                delete jsonevents['events'][key]["users"][message.author.id];
                fs.writeFile(eventsjson, JSON.stringify(jsonevents),'utf8');
                sayMessage += "```User is no longer part of the event "+jsonevents['events'][key]["name"]+"```";
            } else {
                sayMessage += "```user is not in the event "+jsonevents['events'][key]["name"]+"```";
            }
        } else {
            sayMessage += "```Why do we have no users```";
        }
    } else {
        //sayMessage += "```No event found```";
    }
});

我需要能够通过传入用户名来访问 key ，所以 user2 会给我 14300995184 这样我就可以使用它从事件。

Answer 1

您可以搜索Object.entries使用 find() 并返回正确的对象。它会返回一个 key/value 的数组，key 就是你想要的:

let users = {
    "2211392761":{"username":"user1"},
    "14300995184":{"username":"user2"},
    "2781554712":{"username":"user3"},
    "3554341":{"username":"user4"},
    "202611":{"username":"user5"},
    "17754300653761":{"username":"user6"}
}

let found = Object.entries(users).find(([key, value]) => value.username === "user2")
console.log(found && found[0]) // found is undefined if not found