掌握 JavaScript JSON：解析、字符串化及其他

<code>{
  "姓名": "张三",
  "年龄": 30,
  "是否学生": false,
  "课程": ["数学", "科学", "历史"],
  "地址": {
    "街道": "主街 123 号",
    "城市": "纽约",
    "邮编": "10001"
  }
}</code>

<code>   { "键": "值" }</code>

<code class="javascript">const jsonString = '{"name": "John", "age": 30}';
const jsonObject = JSON.parse(jsonString);
console.log(jsonObject.name); // 输出：John</code>

<code class="javascript">const jsObject = { name: "Jane", age: 25 };
const jsonString = JSON.stringify(jsObject);
console.log(jsonString); // 输出：{"name":"Jane","age":25}</code>

<code>   {
     "主题": "深色",
     "语言": "en",
     "显示通知": true
   }</code>

<code>   {
     "位置": "纽约",
     "温度": 25,
     "预报": ["晴天", "多云", "雨天"]
   }</code>

<code class="javascript">const user = { name: "Alice", age: 28 };
localStorage.setItem("user", JSON.stringify(user));
const retrievedUser = JSON.parse(localStorage.getItem("user"));
console.log(retrievedUser.name); // 输出：Alice</code>

<code class="javascript">const jsonString = '{"students": ["Alice", "Bob", "Charlie"]}';
const jsonObject = JSON.parse(jsonString);
console.log(jsonObject.students[1]); // 输出：Bob</code>

<code class="javascript">const jsonString = '{"user": {"name": "Eve", "address": {"city": "Boston"}}}';
const jsonObject = JSON.parse(jsonString);
console.log(jsonObject.user.address.city); // 输出：Boston</code>

<code class="javascript">try {
  const invalidJSON = '{"name": "John", "age": 30'; // 缺少右括号
  JSON.parse(invalidJSON);
} catch (error) {
  console.error("无效的 JSON 格式:", error.message);
}</code>

<code>   {"name":"John","age":30}</code>