从返回的JSON字符串中获取key:value

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

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

import json

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

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