Seems like key, value is a lot more common than value, key . Even the Map constructor expects an array of [key, value] pairs. javascript ... ... <看更多>

The order of objects in the map is the same as the insertion order. forEach(callback[, thisArg]) – invokes a callback for each key-value pair in the map in the ... ... <看更多>

Map Methods ; has(), Returns true if a key exists in a Map ; forEach(), Invokes a callback for each key/value pair in a Map ; entries(), Returns an iterator object ... ... <看更多>

forEach ((value, key) => (obj[key] = value));. ... <看更多>