Portals

[pluscai]

Portals

Portals provide a first-class way to render children into a DOM node that exists outside the DOM hierarchy of the parent component.

可以将组件渲染至指定DOM

render() {
  // React does *not* create a new div. It renders the children into `domNode`.
  // `domNode` is any valid DOM node, regardless of its location in the DOM.
  return ReactDOM.createPortal(
    this.props.children,
    domNode
  );
}