const debounce = function(fn, delay, immediate = false) { let timer; let promise; return function () { const context = this; const args = arguments; // 如果已经存在 promise，直接返回（等待正在执行的） if (promise) { return promise; } // 创建新的 promise promise = new Promise((resolve, reject) => { if (immediate) { // 立即执行 try { const result = fn.apply(context, args); // 如果结果是 promise，等待它完成 if (result && typeof result.then === 'function') { result.then(resolve).catch(reject); } else { resolve(result); } } catch (error) { reject(error); } // 设置定时器，在 delay 时间后重置 promise，允许下次调用 timer = setTimeout(() => { promise = null; }, delay); } else { // 延迟执行 timer = setTimeout(() => { try { const result = fn.apply(context, args); // 如果结果是 promise，等待它完成 if (result && typeof result.then === 'function') { result.then(resolve).catch(reject); } else { resolve(result); } } catch (error) { reject(error); } // 重置 promise promise = null; }, delay); } }); return promise; }; }; class HomeData { constructor() { this.earnPointsPlan = Promise.resolve({}); this.redeemPlan = Promise.resolve({}); this.getMemberDetailDebounce = debounce( this.getMemberDetail.bind(this), 200, true // 首次立即执行 ); this.memberDetail = this.getMemberDetailDebounce(); } refreshAllData() { this.getMemberDetailDebounce(); } getMemberDetail() { const memberPromise = fetch( "\/api\/loyalty-server\/member" ).then((response) => { // not login // 用null 和undefined来区分用户状态，因为已经很多地方用!!data.member来判断了，这是最简单的方式。 // null: not member // undefined: not login if (response.status === 401) { return undefined; } else if (response.status === 404) { // not member return null } else if (!response.ok) { return null } return response.json(); }); const tierDetail = fetch( "\/api\/loyalty-server\/tier-details" ).then((response) => response.json()); const fetchPromise = Promise.all([memberPromise, tierDetail]).then(([memberDetail, tierList]) => { const currentTierIndex = tierList.tier_details.findIndex((tier) => tier.id === memberDetail?.tier_id) return { member: memberDetail, current_tier: tierList.tier_details[currentTierIndex === -1 ? 0 : currentTierIndex], next_tier: currentTierIndex === tierList.tier_details.length - 1 ? null : tierList.tier_details[currentTierIndex + 1] } }) this.memberDetail = fetchPromise; return fetchPromise; } getPointPlans(eventType) { const url = "\/api\/loyalty-server\/earn-points\/campaigns" const fetchPromise = fetch(`${url}${eventType ? `?event_types=${eventType}` : ''}`).then((response) => response.json()); this.earnPointsPlan = fetchPromise; return fetchPromise; } getPointsDeduction() { const fetchPromise = fetch( "\/api\/loyalty-server\/points-deduction\/campaign" ).then((response) => response.json()); this.pointsDeduction = fetchPromise; return fetchPromise; } getCompleteTipStorage() { return Promise.resolve(window.sessionStorage.getItem('loyalty-complete-tip-status')); } saveCompleteTipStorage() { return Promise.resolve(window.sessionStorage.setItem('loyalty-complete-tip-status', 'true')); } } const initData = new HomeData(); exportFunction("memberDetail", () => initData.memberDetail); exportFunction("earnPointData", () => initData.earnPointsPlan); exportFunction("refreshAllData", initData.refreshAllData.bind(initData)); exportFunction("refreshMemberDetail", initData.getMemberDetail.bind(initData)); exportFunction("refreshPointData", initData.getPointPlans.bind(initData)); exportFunction("getCompleteTipStorage", initData.getCompleteTipStorage.bind(initData)); exportFunction("saveCompleteTipStorage", initData.saveCompleteTipStorage.bind(initData)); const getBenefitCardData = () => { return Promise.all([initData.memberDetail, initData.getPointsDeduction()]).then(([memberDetail, pointsDeduction]) => { if(!memberDetail.member) { return initData.getPointPlans('become_member').then((pointPlans) => { return { memberDetail, pointPlans, pointsDeduction, } }) } else { return fetch( "\/api\/loyalty-server\/recommend-discount-code\/card-campaigns" ).then((response) => { return response.json(); }).then((coupon_recommendation) => { return { memberDetail, coupon_recommendation, pointsDeduction, } }); } }).catch((error) => { console.log('fetch benefit card data', error) }) } exportFunction("getBenefitCardData", getBenefitCardData);
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