Function inDoc

01.GettingStarted/js/vue.js:1147–1152

* Check if a node is in the document. * Note: document.documentElement.contains should work here * but always returns false for comment nodes in phantomjs, * making unit tests difficult. This is fixed by doing the * contains() check on the node's parentNode instead of * the node itsel

(node)

   */

  function inDoc(node) {
    if (!node) return false;
    var doc = node.ownerDocument.documentElement;
    var parent = node.parentNode;
    return doc === node || doc === parent || !!(parent && parent.nodeType === 1 && doc.contains(parent));
  }

  /**
   * Get and remove an attribute from a node.