Question

所以我想要以后可以访问的多个值。这是我试过的：

function extraTime(input) {
        var dayAndMonth = {
            Oct: 'October',
            Jul: 'July',
            Aug: 'August',
            Jun: 'July',
            Apr: 'April',
            Feb: 'February',
            Mar: 'March',
            Jan: 'January',
            Thu: 'Thursday,',
            Sat: 'Saturday,',
            Wed: 'Wednesday,',
        };
        return dayAndMonth.input
    }

例如，我的输入将为'Wed'。我想回复'Wednesday'作为回应。我之前见过这样的事情，但不确定我是否正确行事。我以为它被称为地图。

Answer 1

您可以使用括号function extraTime(input) { var dayAndMonth = { Oct: 'October', Jul: 'July', Aug: 'August', Jun: 'July', Apr: 'April', Feb: 'February', Mar: 'March', Jan: 'January', Thu: 'Thursday,', Sat: 'Saturday,', Wed: 'Wednesday,', }; return dayAndMonth[input]; } console.log(extraTime('Mar'));表示法：

[]

Answer 2

您需要使用括号表示法来访问您的对象，例如

MongoClient mongo = new MongoClient();
DB db = mongo.getDB("pingax");

DBCollection coll = db.getCollection("aggregationExample");

/*
 MONGO SHELL : db.aggregationExample.aggregate(
 {$match : {type : "local"}} ,
 {$project : { department : 1 , amount : 1 }}
 );
 */
 DBObject match = new BasicDBObject("$match", new BasicDBObject("type", "local")); 

 DBObject project = new BasicDBObject("$project", new BasicDBObject("department", 1).append("amount", 1));

 AggregationOutput output = coll.aggregate(match,project,group,sort);

所以你的完整功能可能如下所示：

dayAndMonth['Wed']

协助访问和存储值

2 个答案: