为您的 Lovable 应用实现版本检查和强制更新

const ua = navigator.userAgent;
const inApp = ua.includes("WebViewGold");
const platform = ua.includes("WebViewGold-Android") ? "android" : "ios";

function compareVersions(a, b) {
  const pa = String(a).split(".").map(Number);
  const pb = String(b).split(".").map(Number);
  for (let i = 0; i < Math.max(pa.length, pb.length); i++) {
    const d = (pa[i] || 0) - (pb[i] || 0);
    if (d !== 0) return d < 0 ? -1 : 1;
  }
  return 0;
}

// autoInjectVariable / AUTO_INJECT_VARIABLES = true 时会提供 versionNumber;
// 否则请在轮询前先执行一次 window.location.href = "getappversion://"
function waitForVersion(ms = 3000) {
  return new Promise((resolve) => {
    const start = Date.now();
    (function poll() {
      if (typeof versionNumber !== "undefined") return resolve(String(versionNumber));
      if (Date.now() - start > ms) return resolve(null);
      setTimeout(poll, 100);
    })();
  });
}

async function checkAppVersion() {
  if (!inApp) return;                         // 浏览器中无需处理
  const installed = await waitForVersion();
  if (!installed) return;                     // 版本未知时放行
  const rule = await fetch("/api/app-version?platform=" + platform)
    .then((r) => (r.ok ? r.json() : null)).catch(() => null);
  if (!rule) return;                          // 后端不可达时放行
  if (compareVersions(installed, rule.minimum) < 0) showUpdateRequired(rule.storeUrl);
  else if (compareVersions(installed, rule.latest) < 0) showUpdateBanner(rule.storeUrl);
}