从JSON中的对象获取项

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

var json = '{"name":"John","age":30,"city":"New York"}';
var obj = JSON.parse(json);

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

import json

json_str = '{"name":"John","age":30,"city":"New York"}'
obj = json.loads(json_str)

print(obj['name']) # 输出：John
print(obj['age']) # 输出：30
print(obj['city']) # 输出：New York

import org.json.JSONObject;

String jsonStr = "{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}";
JSONObject obj = new JSONObject(jsonStr);

System.out.println(obj.getString("name")); // 输出：John
System.out.println(obj.getInt("age")); // 输出：30
System.out.println(obj.getString("city")); // 输出：New York