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スムーススクロール(ページ内移動)

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//ページ内リンクのURLが "#"から始まる時(ex. "#service"や"#about")

script.js
  $('a[href^="#"]').click(function () {
    // スクロールの速度
    var speed = 400; // ミリ秒で記述
    var href = $(this).attr('href');
    var target = $(href === '#' || href === "" ? 'html' : href);
    var position = target.offset().top;
    $('body,html').animate({ scrollTop: position }, speed, 'swing');
    return false;
  });

//ページ内リンクのURLが "/#"から始まる時(ex. "/#service"や"/#about")

script.js
$(document).on('click', 'a[href*="#"]', function() {
  let time = 400;
  let target = $(this.hash);
  if (!target.length) return;
  let targetY = target.offset().top;
  $('html,body').animate({scrollTop: targetY}, time, 'swing');
  return false;
});
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