app/index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <title>CODELF</title>
  <meta name="description" content="Best GitHub stars, repositories tagger and organizer. Search over projects from Github, Bitbucket, Google Code, Codeplex, Sourceforge, Fedora Project, GitLab to find real-world usage variable names." />
  <meta name="keywords" content="Codelf,变量命名,函数命名,方法命名,变量命名神器,GitHub 分组,Organize GitHub stars,naming things,naming convention,programming naming">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <link rel="shortcut icon" href="images/codelf_logo.png" >
  <link rel="apple-touch-icon" sizes="144x144"  href="images/codelf_logo.png">
  <link rel="apple-touch-icon-precomposed" href="images/codelf_logo.png">
  <link title="CODELF" type="application/opensearchdescription+xml" rel="search" href="./opensearch.xml">
  <script>
    // auto redirect to HTTPS
    if (window.location.protocol != "https:"){
      window.location.protocol = "https";
    }
  </script>
  <link type="text/css" rel="stylesheet" href="./css/lib.css">
  <link type="text/css" rel="stylesheet" href="./css/app.css">
  <script src="./js/lib.js"></script>
</head>
<body ontouchstart>
<div class="app"></div>
<script src="./js/app.js"></script>
<script>
  if (/https/.test(location.protocol) && 'serviceWorker' in navigator) {
    if (!Cache.prototype.add) {
      Cache.prototype.add = function add(request) {
        return this.addAll([request]);
      };
    }

    if (!Cache.prototype.addAll) {
      Cache.prototype.addAll = function addAll(requests) {
        var cache = this;

        // Since DOMExceptions are not constructable:
        function NetworkError(message) {
          this.name = 'NetworkError';
          this.code = 19;
          this.message = message;
        }
        NetworkError.prototype = Object.create(Error.prototype);

        return Promise.resolve().then(function() {
          if (arguments.length < 1) throw new TypeError();

          // Simulate sequence<(Request or USVString)> binding:
          var sequence = [];

          requests = requests.map(function(request) {
            if (request instanceof Request) {
              return request;
            }
            else {
              return String(request); // may throw TypeError
            }
          });

          return Promise.all(
            requests.map(function(request) {
              if (typeof request === 'string') {
                request = new Request(request);
              }

              var scheme = new URL(request.url).protocol;

              if (scheme !== 'http:' && scheme !== 'https:') {
                throw new NetworkError("Invalid scheme");
              }

              return fetch(request.clone());
            })
          );
        }).then(function(responses) {
          // TODO: check that requests don't overwrite one another
          // (don't think this is possible to polyfill due to opaque responses)
          return Promise.all(
            responses.map(function(response, i) {
              return cache.put(requests[i], response);
            })
          );
        }).then(function() {
          return undefined;
        });
      };
    }

    if (!CacheStorage.prototype.match) {
      // This is probably vulnerable to race conditions (removing caches etc)
      CacheStorage.prototype.match = function match(request, opts) {
        var caches = this;

        return this.keys().then(function(cacheNames) {
          var match;

          return cacheNames.reduce(function(chain, cacheName) {
            return chain.then(function() {
              return match || caches.open(cacheName).then(function(cache) {
                return cache.match(request, opts);
              }).then(function(response) {
                match = response;
                return match;
              });
            });
          }, Promise.resolve());
        });
      };
    }

    if ('serviceWorker' in navigator) {
      // Delay registration until after the page has loaded, to ensure that our
      // precaching requests don't degrade the first visit experience.
      // See https://developers.google.com/web/fundamentals/instant-and-offline/service-worker/registration
      window.addEventListener('load', function() {
        // Your service-worker.js *must* be located at the top-level directory relative to your site.
        // It won't be able to control pages unless it's located at the same level or higher than them.
        // *Don't* register service worker file in, e.g., a scripts/ sub-directory!
        // See https://github.com/slightlyoff/ServiceWorker/issues/468
        navigator.serviceWorker.register('sw.js').then(function(reg) {
          setInterval(reg.update, 60 * 60 * 1000); // update the service worker hourly
          // updatefound is fired if service-worker.js changes.
          reg.onupdatefound = function() {
            // The updatefound event implies that reg.installing is set; see
            // https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-container-updatefound-event
            var installingWorker = reg.installing;

            installingWorker.onstatechange = function() {
              switch (installingWorker.state) {
                case 'installed':
                  if (navigator.serviceWorker.controller) {
                    // At this point, the old content will have been purged and the fresh content will
                    // have been added to the cache.
                    // It's the perfect time to display a "New content is available; please refresh."
                    // message in the page's interface.
                    console.log('New or updated content is available.');
                  } else {
                    // At this point, everything has been precached.
                    // It's the perfect time to display a "Content is cached for offline use." message.
                    console.log('Content is now available offline!');
                  }
                  break;

                case 'redundant':
                  console.error('The installing service worker became redundant.');
                  break;
              }
            };
          };
        }).catch(function(e) {
          console.error('Error during service worker registration:', e);
        });
      });
    }
  }
</script>
</body>
</html>