【jQuery】遅延表示『inview.js』と『lazysizes.js』を組み合わせて、『重いページよ、さようなら』

HTML

<div class="section">
  <div class="imgBox inview fadeIn_up">
    <img src="https://125naroom.com/demo/img/simple01.jpg" alt="">
  </div>
  <div class="imgBox inview fadeIn_up">
    <img src="https://125naroom.com/demo/img/simple02.jpg" alt="">
  </div>
  <div class="txtBox inview fadeIn_up">
    <p>ふわっと</p>
  </div>
</div>

CSS

.fadeIn_up {
  opacity: 0;
  transform: translate(0, 50%);
  transition: 2s;
}
.fadeIn_up.is-show {
  transform: translate(0, 0);
  opacity: 1;
}

jQuery

$(function(){
  $(".inview").on("inview", function (event, isInView) {
    if (isInView) {
      $(this).stop().addClass("is-show");
    }
  });
});

HTML

<div class="section">
  <div class="imgBox">
    <img data-src="https://125naroom.com/demo/img/simple01.jpg" alt="" class="lazyload">
  </div>
  <div class="imgBox">
    <img data-src="https://125naroom.com/demo/img/simple02.jpg" alt="" class="lazyload">
  </div>
  <div class="imgBox">
    <img data-src="https://125naroom.com/demo/img/simple03.jpg" alt="" class="lazyload">
  </div>
</div>

CSS

.imgBox {
	text-align: center;
	margin: 50px 0;
}
.imgBox img {
	max-width: 100%;
	height: auto;
	vertical-align: top;
}

HTML

<div class="section">
  <div class="imgBox inview fadeIn_up">
    <img src="https://125naroom.com/demo/img/simple01.jpg" alt="" class="lazyload">
  </div>
  <div class="imgBox inview fadeIn_up">
    <img src="https://125naroom.com/demo/img/simple02.jpg" alt="" class="lazyload">
  </div>
  <div class="txtBox inview fadeIn_up">
    <p>ふわっと</p>
  </div>
</div>

CSS

.fadeIn_up {
  opacity: 0;
  transform: translate(0, 50%);
  transition: 2s;
}
.fadeIn_up.is-show {
  transform: translate(0, 0);
  opacity: 1;
}

JavaScript

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery.inview/1.0.0/jquery.inview.min.js"></script>
<script type="text/javascript" src="js/lazysizes.min.js"></script>

$(function(){
  $(".inview").on("inview", function (event, isInView) {
    if (isInView) {
      $(this).stop().addClass("is-show");
    }
  });
});