Function hydrate

static/vuejs/vue.common.js:4971–5030

(elm, vnode, insertedVnodeQueue)

  // Note: this is a browser-only function so we can assume elms are DOM nodes.
  function hydrate (elm, vnode, insertedVnodeQueue) {
    if (process.env.NODE_ENV !== 'production') {
      if (!assertNodeMatch(elm, vnode)) {
        return false
      }
    }
    vnode.elm = elm;
    var tag = vnode.tag;
    var data = vnode.data;
    var children = vnode.children;
    if (isDef(data)) {
      if (isDef(i = data.hook) && isDef(i = i.init)) { i(vnode, true /* hydrating */); }
      if (isDef(i = vnode.componentInstance)) {
        // child component. it should have hydrated its own tree.
        initComponent(vnode, insertedVnodeQueue);
        return true
      }
    }
    if (isDef(tag)) {
      if (isDef(children)) {
        // empty element, allow client to pick up and populate children
        if (!elm.hasChildNodes()) {
          createChildren(vnode, children, insertedVnodeQueue);
        } else {
          var childrenMatch = true;
          var childNode = elm.firstChild;
          for (var i$1 = 0; i$1 < children.length; i$1++) {
            if (!childNode || !hydrate(childNode, children[i$1], insertedVnodeQueue)) {
              childrenMatch = false;
              break
            }
            childNode = childNode.nextSibling;
          }
          // if childNode is not null, it means the actual childNodes list is
          // longer than the virtual children list.
          if (!childrenMatch || childNode) {
            if (process.env.NODE_ENV !== 'production' &&
                typeof console !== 'undefined' &&
                !bailed) {
              bailed = true;
              console.warn('Parent: ', elm);
              console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
            }
            return false
          }
        }
      }
      if (isDef(data)) {
        for (var key in data) {
          if (!isRenderedModule(key)) {
            invokeCreateHooks(vnode, insertedVnodeQueue);
            break
          }
        }
      }
    } else if (elm.data !== vnode.text) {
      elm.data = vnode.text;
    }