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CSS

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HTML 

              
                <header>
  <h1>【jQuery】ページ内リンクでスムーズスクロール（固定ヘッダーがあったら）</h1>
</header>

<section>
  <div class="inner">

    <ul class="list" id="m_01">
      <li><a href="#1">1</a></li>
      <li><a href="#2">2</a></li>
      <li><a href="#3">3</a></li>
      <li><a href="#4">4</a></li>
      <li><a href="#5">5</a></li>
      <li><a href="#6">6</a></li>
    </ul>

    <div class="oneArea" id="1">
      <div class="one_title">1</div>
      <a class="button" href="#m_01">▲ メニューに戻る</a>
    </div>

    <div class="oneArea" id="2">
      <div class="one_title">2</div>
      <a class="button" href="#m_01">▲ メニューに戻る</a>
    </div>

    <div class="oneArea" id="3">
      <div class="one_title">3</div>
      <a class="button" href="#m_01">▲ メニューに戻る</a>
    </div>

    <div class="oneArea" id="4">
      <div class="one_title">4</div>
      <a class="button" href="#m_01">▲ メニューに戻る</a>
    </div>

    <div class="oneArea" id="5">
      <div class="one_title">5</div>
      <a class="button" href="#m_01">▲ メニューに戻る</a>
    </div>

    <div class="oneArea" id="6">
      <div class="one_title">6</div>
      <a class="button" href="#m_01">▲ メニューに戻る</a>
    </div>

    <p class="_a"><a href="https://125naroom.com/web/3476" target="_blank" class="link">View the note</a></p>

  </div>
</section>
!

CSS 

              
                header {
	position: -webkit-sticky;
	position: sticky;
	top: 0;
	z-index: +1;
}
header h1 {
	font-size: 22px;
	line-height: 2.0;
	padding: 1em .5em;
	margin: 3em 0 0;
	text-align: center;
  background: #FFEB3B;
}
section {
	background: #e5dfd3;
	padding: 120px 20px;
}
section .inner {
  max-width: 1024px;
  margin: 0 auto;
}
section .oneArea {
	margin-bottom: 200px;
}
section ul.list {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	list-style-type: none;
	margin: 0 0 100px;
	padding: 0;
	box-sizing: border-box;
}
section ul.list li {
	width: calc(100% / 6);
	text-align: center;
}
section ul.list li a {
	display: block;
	padding: 10px;
	text-decoration: none;
	color: #fff;
	background: #333;
	border-right: 1px solid #fff;
	transition-duration: 0.3s;
}
section ul.list li:last-child a {
	border-right: none;
}
section ul.list li a:hover {
	opacity: 0.7;
}
section .oneArea .one_title {
	color: #fff;
	text-align: center;
	padding: 10px;
	background: #333;
}
section .oneArea a.button {
	display: block;
	font-size: 12px;
	color: #333333;
	text-align: center;
	background: #f2f2f2;
	padding: 10px;
	text-decoration: none;
	transition-duration: 0.3s;
	margin-top: 40px;
}
section .oneArea a.button:hover {
	opacity: 0.7;
}
/*==============
common
==============*/
body {
  font-family: YuGothic, "游ゴシック体", "Yu Gothic", "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
  line-height: 1.8;
  margin: 0;
  background: #fff;
}
p._a {
  font-size: 12px;
  font-weight: bold;
  margin: 30px 0 0;
}
p._a .link {
  display: inline-block;
  color: #607D8B;
  padding-left: 1.3em;
  text-indent: -1.3em;
}
p._a .link:before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  border-top: 2px solid #607D8B;
  border-right: 2px solid #607D8B;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
  margin-right: 10px;
}
!

JS 

              
                // ページ内リンク
$(function(){
  var headerHeight = $('header').outerHeight(); // ヘッダーについているID、クラス名など、余白を開けたい場合は + 10を追記する。
  var urlHash = location.hash; // ハッシュ値があればページ内スクロール
  if(urlHash) { // 外部リンクからのクリック時
    $('body,html').stop().scrollTop(0); // スクロールを0に戻す
    setTimeout(function(){ // ロード時の処理を待ち、時間差でスクロール実行
      var target = $(urlHash);
      var position = target.offset().top - headerHeight;
      $('body,html').stop().animate({scrollTop:position}, 500); // スクロール速度ミリ秒
    }, 100);
  }
  $('a[href^="#"]').click(function(){ // 通常のクリック時
    var href= $(this).attr("href"); // ページ内リンク先を取得
    var target = $(href);
    var position = target.offset().top - headerHeight;
    $('body,html').stop().animate({scrollTop:position}, 500); // スクロール速度ミリ秒
    return false; // #付与なし、付与したい場合は、true
  });
});

// ヘッダー固定（IEではPolyfillを使う）
$(function() {
  var elements = document.querySelectorAll('header');
  Stickyfill.add(elements);
});
!
999px

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