dist/vue-inview.js
function (bidd, callback) {
  if (!isDefine(bidd.arg)) callback()
  if (bidd.arg === 'on' || bidd.arg === 'once' && objLength(bidd.modifiers) === 0) callback()
}
function (bidd, callback) {
  if (!isDefine(bidd.arg)) callback()
  if (bidd.arg === 'on' || bidd.arg === 'once' && objLength(bidd.modifiers) === 0) callback()
}
(bidd → object{arg → string, modifiers → array}, callback → function)
- check and call callback action