신뢰 확보 : 서비스 분야 약속 적용 사례

function checkUsername(username) { return new Promise((resolve, reject) => { // 异步操作，检查用户名是否已存在 setTimeout(() => { if (用户名已存在) reject("用户名已存在"); else resolve(); }, 1000); }); } function createUser(username, password) { return new Promise((resolve, reject) => { // 异步操作，创建用户 setTimeout(() => { // 业务逻辑... resolve(); }, 1000); }); } function sendEmail(username) { return new Promise((resolve, reject) => { // 异步操作，发送邮件 setTimeout(() => { // 业务逻辑... resolve(); }, 1000); }); } checkUsername("testuser") .then(() => createUser("testuser", "123456")) .then(() => sendEmail("testuser")) .then(() => { console.log("注册成功"); }) .catch((error) => { console.error("注册失败：" + error); });

function checkStock(order) { return new Promise((resolve, reject) => { // 异步操作，检查库存 setTimeout(() => { // 业务逻辑... if (库存充足) resolve(); else reject("库存不足"); }, 1000); }); } function payOrder(order) { return new Promise((resolve, reject) => { // 异步操作，支付订单 setTimeout(() => { // 业务逻辑... resolve(); }, 1000); }); } function shipOrder(order) { return new Promise((resolve, reject) => { // 异步操作，发货 setTimeout(() => { // 业务逻辑... resolve(); }, 1000); }); } checkStock(order) .then(() => payOrder(order)) .then(() => shipOrder(order)) .then(() => { console.log("订单处理完成"); }) .catch((error) => { console.error("订单处理出错：" + error); });