比如:var m = {a : 1, b : 2}
m[a]的值就是1了。
var map = {}// Map map = new HashMap()map[key] = value// map.put(key, value)
var value = map[key]// Object value = map.get(key)
var has = key in map// boolean has = map.containsKey(key)
delete map[key]// map.remove(key)
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