Function get

docsify.js:463–524

* Simple ajax get * @param {string} url * @param {boolean} [hasBar=false] has progress bar * @return { then(resolve, reject), abort }

(url, hasBar, headers)

     * @return { then(resolve, reject), abort }
     */
    function get(url, hasBar, headers) {
      if ( hasBar === void 0 ) hasBar = false;
      if ( headers === void 0 ) headers = {};
    
      var xhr = new XMLHttpRequest();
      var on = function () {
        xhr.addEventListener.apply(xhr, arguments);
      };
      var cached$$1 = cache[url];
    
      if (cached$$1) {
        return {then: function (cb) { return cb(cached$$1.content, cached$$1.opt); }, abort: noop}
      }
    
      xhr.open('GET', url);
      for (var i in headers) {
        if (hasOwn.call(headers, i)) {
          xhr.setRequestHeader(i, headers[i]);
        }
      }
      xhr.send();
    
      return {
        then: function (success, error) {
          if ( error === void 0 ) error = noop;
    
          if (hasBar) {
            var id = setInterval(
              function (_) { return progressbar({
                  step: Math.floor(Math.random() * 5 + 1)
                }); },
              500
            );
    
            on('progress', progressbar);
            on('loadend', function (evt) {
              progressbar(evt);
              clearInterval(id);
            });
          }
    
          on('error', error);
          on('load', function (ref) {
            var target = ref.target;
    
            if (target.status >= 400) {
              error(target);
            } else {
              var result = (cache[url] = {
                content: target.response,
                opt: {
                  updatedAt: xhr.getResponseHeader('last-modified')
                }
              });
    
              success(result.content, result.opt);
            }
          });