要遍历 JavaScript 对象，可以使用以下方法：1. for...in 循环；2. Object.keys() 方法；3. Object.values() 方法；4. Object.entries() 方法；5. forEach() 方法。
如何使用 JavaScript 遍历对象
要遍历 JavaScript 对象，可以使用以下方法：
1. for...in 循环
const obj = {
name: "John Doe",
age: 30,
city: "New York"
};
for (let key in obj) {
console.log(key); // 输出 "name", "age", "city"
}2. Object.keys() 方法
const obj = {
name: "John Doe",
age: 30,
city: "New York"
};
const keys = Object.keys(obj);
console.log(keys); // 输出 ["name", "age", "city"]3. Object.values() 方法
const obj = {
name: "John Doe",
age: 30,
city: "New York"
};
const values = Object.values(obj);
console.log(values); // 输出 ["John Doe", 30, "New York"]4. Object.entries() 方法
const obj = {
name: "John Doe",
age: 30,
city: "New York"
};
const entries = Object.entries(obj);
console.log(entries); // 输出 [["name", "John Doe"], ["age", 30], ["city", "New York"]]5. forEach() 方法
const obj = {
name: "John Doe",
age: 30,
city: "New York"
};
obj.forEach((value, key) => {
console.log(`${key}: ${value}`);
}); 
