dist/vue-inview.js
function (el) {
  var className = el.className
  var listClass = className.split(' ')
  this.classList = listClass
  this.el = el
}
function (el) {
  var className = el.className
  var listClass = className.split(' ')
  this.classList = listClass
  this.el = el
}
new object function for unsupport classList