Function resolveSlots

06.Router/basic/js/vue.js:7770–7797

* Scan and determine slot content distribution. * We do this during transclusion instead at compile time so that * the distribution is decoupled from the compilation order of * the slots. * * @param {Element|DocumentFragment} template * @param {Element} content * @param {Vue} vm

(vm, content)

   */

  function resolveSlots(vm, content) {
    if (!content) {
      return;
    }
    var contents = vm._slotContents = Object.create(null);
    var el, name;
    for (var i = 0, l = content.children.length; i < l; i++) {
      el = content.children[i];
      /* eslint-disable no-cond-assign */
      if (name = el.getAttribute('slot')) {
        (contents[name] || (contents[name] = [])).push(el);
      }
      /* eslint-enable no-cond-assign */
      if ('development' !== 'production' && getBindAttr(el, 'slot')) {
        warn('The "slot" attribute must be static.', vm.$parent);
      }
    }
    for (name in contents) {
      contents[name] = extractFragment(contents[name], content);
    }
    if (content.hasChildNodes()) {
      var nodes = content.childNodes;
      if (nodes.length === 1 && nodes[0].nodeType === 3 && !nodes[0].data.trim()) {
        return;
      }
      contents['default'] = extractFragment(content.childNodes, content);
    }
  }

  /**
   * Extract qualified content nodes from a node list.