Function registerRef

static/vuejs/vue.common.js:4472–4496

(vnode, isRemoval)

};

function registerRef (vnode, isRemoval) {
  var key = vnode.data.ref;
  if (!key) { return }

  var vm = vnode.context;
  var ref = vnode.componentInstance || vnode.elm;
  var refs = vm.$refs;
  if (isRemoval) {
    if (Array.isArray(refs[key])) {
      remove(refs[key], ref);
    } else if (refs[key] === ref) {
      refs[key] = undefined;
    }
  } else {
    if (vnode.data.refInFor) {
      if (Array.isArray(refs[key]) && refs[key].indexOf(ref) < 0) {
        refs[key].push(ref);
      } else {
        refs[key] = [ref];
      }
    } else {
      refs[key] = ref;
    }
  }
}

/**
 * Virtual DOM patching algorithm based on Snabbdom by