无法从Javascript中的REST-API访问JSON响应的变量

{
  "name": "John",
  "age": 30,
  "city": "New York"
}

var response = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

console.log(response.name); // 输出：John
console.log(response.age); // 输出：30
console.log(response.city); // 输出：New York

var response = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

console.log(response["name"]); // 输出：John
console.log(response["age"]); // 输出：30
console.log(response["city"]); // 输出：New York

var response = [
  {"name": "John", "age": 30},
  {"name": "Jane", "age": 25}
];

console.log(response[0].name); // 输出：John
console.log(response[1].age); // 输出：25