height計算サンプル1

by dxokoya

HTML

<div class="wrap">
  <img class="piyo" src="https://placehold.jp/3d4070/ffffff/375x667.png" alt="">
</div>

CSS

body {
  margin: 0;
  min-height: 100vh;
}
.wrap {
  display: flex;
}
.piyo {
  display: block;
  width: auto;
  object-fit: contain;
}

JavaScript

$(window).on('load', function () {
  var innerHeight = window.innerHeight;
  $('.piyo').css('height', innerHeight + 'px'); //piyoは任意の値に変えてください。
});