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              <img src="https://placehold.jp/30/eeeeee/333333/750x1334.png?text=iPhone%20Screen%20Shot" />

<img src="https://placehold.jp/30/eeeeee/333333/750x1334.png?text=iPhone%20Screen%20Shot" />
            
          
!
            
              function resizeImage(image) {
  // 取得したimg要素の幅と高さを取得
  var width  = image.clientWidth;
  var height = image.clientHeight;

  // ユーザーエージェントを取得
  var userAgent = window.navigator.userAgent;

  // 要素が幅<高さのときに縮小表示
  if(width < height) {
    // ユーザーエージェントでスマートフォンとPCを判定
    if(userAgent.indexOf("iPhone") != -1 || userAgent.indexOf("Android") != -1) {
      image.style.display = "block";
      // 親要素の幅の60%で表示
      image.style.width = "60%";
      // img要素をセンタリング表示
      image.style.margin = "0 auto";
      image.style.marginBottom = "30px";
    } else {
      image.style.display = "block";
      // 親要素の幅の40%で表示
      image.style.width = "40%";
      // img要素をセンタリング表示
      image.style.margin = "0 auto";
      image.style.marginBottom = "30px";
    }
  }
}

// img要素を取得
var images = document.getElementsByTagName("img");

for(var i = 0; i < images.length; i++) {
  resizeImage(images[i]);
}

            
          
!
999px
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