index.js
function render (state) {
    if (update) return update(state)
    const loop = mainLoop(state, renderFn(rend), vdom)
    update = loop.update
    return loop.target
  }
function render (state) {
    if (update) return update(state)
    const loop = mainLoop(state, renderFn(rend), vdom)
    update = loop.update
    return loop.target
  }
function render ( state ) { if ( update ) return update ( state ) const loop = mainLoop ( state , renderFn ( rend ) , vdom ) update = loop . update return loop . target }
render the element's vdom tree to DOM nodes which can be mounted on the DOM any? -> DOMNode
render the element s vdom tree to DOM nodes which can be mounted on the DOM any? - > DOMNode