【jQuery】transitionを使用して半透明なテキストを一文字ずつ不透明な状態に変化させるアニメーションの実装方法のデモページ

<div class="wrap">
  <p class="text">Dummytext01</p>
</div>

$(function(){
  $('.text').children().addBack().contents().each(function() {
      $(this).replaceWith($(this).text().replace(/(\S)/g, '<span>$&</span>'));
  });
});
$(window).on('load', function(){
  $(".text").addClass("active");
});

.wrap {
  width: 768px;
  margin: 0 auto;
}

.text {
  margin: 200px 0 0;
  text-align: center;
  font-size: 50px;
}

.text span {
  opacity: 0.5;
}

.text span:nth-child(1) {
  transition: opacity 0.8s ease 0.1s;
}
.text span:nth-child(2) {
  transition: opacity 0.8s ease 0.2s;
}
.text span:nth-child(3) {
  transition: opacity 0.8s ease 0.3s;
}
.text span:nth-child(4) {
  transition: opacity 0.8s ease 0.4s;
}
.text span:nth-child(5) {
  transition: opacity 0.8s ease 0.5s;
}
.text span:nth-child(6) {
  transition: opacity 0.8s ease 0.6s;
}
.text span:nth-child(7) {
  transition:opacity 0.8s ease 0.7s;
}
.text span:nth-child(8) {
  transition: opacity  0.8s ease 0.8s;
}
.text span:nth-child(9) {
  transition: opacity 0.8s ease 0.9s;
}
.text span:nth-child(10) {
  transition: opacity 0.8s ease 1s;
}
.text span:nth-child(11) {
  transition: opacity 0.8s ease 1.1s;
}

.text.active span {
  opacity: 1;
}

@media screen and (max-width:640px){
  .wrap {
    width: 100%;
  }
}