var simpleTabs = {
  init: function(el){
    var tabs = document.querySelector(el)
    if(!tabs){
      return false
    }
    simpleTabs.el = tabs
    simpleTabs.el.addEventListener('click', simpleTabs.change)
  },
  change: function(e){
    var tabItem = e.target
    let id = tabItem.dataset['id']
    if(!id){
      return false
    }
    var current = this.querySelector('.current')
    if(current !== tabItem){
      current.classList.remove('current')
      document.querySelector('#' + current.dataset['id']).classList.remove('tabs-change-visible')
      tabItem.classList.add('current')
      document.querySelector('#' + id).classList.add('tabs-change-visible')
    }
  }
}

simpleTabs.init('#intro_tabs')