我有以下JSON响应，在测试中，我创建了一个要记录/捕获的键列表，但输出返回错误：类型错误：responseData.get不是函数，因为在解释“responseData.i”时作为字符串读取。

JSON response:
{
"Id": 1287,
"LastName": "Trump",
"FirstName": "Donald",
"MiddleName": "Von",
"City": "New York City",
"Phone": "66 77 88",
"State": "New York",
"Fax": "111-222-333",
"ReferenceId": "12345",
"Active": false,
"CurrentWorkingSchemeId": null
}

var responseData = pm.response.json()
var list_data = \["Id", "Fax", "Active"\];
for (i of list_data) {
console.log(responseData.Id, responseData.Fax, responseData.Active);
console.log(i, responseData.i);
console.log(i, responseData.get(i));
}

我需要做什么：响应数据.i =响应数据.Id不是响应数据.i =响应数据.“Id”
谢谢