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HTML

              
                div#app
  header
    span.
      {{ currentNavi }}
  main
    section(id="section_01")
      span コンテンツ1のエリアです
    section(id="section_02")
      span コンテンツ2のエリアです
    section(id="section_03")
      span コンテンツ3のエリアです
    section(id="section_04")
      span コンテンツ4のエリアです
    section(id="section_05")
      span コンテンツ5のエリアです
  
              
            
!

CSS

              
                header
  position: fixed
  background: white
  width: 100%
  height: 40px
  display: flex
  justify-content: center
  align-items: center
  font-size: 14px
  font-weight: bold
main
  padding: 40px 0 0 0
  section
    height: calc(100vh - 40px)
    padding: 20px 10px
    &:nth-child(odd)
      background: skyblue
    &:nth-child(even)
      background: palegreen
  
  
              
            
!

JS

              
                var vueModel = new Vue({
  el: '#app',
  data() {
    return {
      scrollY: 0,
      sectionOffsetTop: []
    }
  },
  computed: {
    currentNavi() {
      if(this.scrollY >= this.sectionOffsetTop[0] && this.scrollY < this.sectionOffsetTop[1]) {
        return 'コンテンツ1'
      } else if(this.scrollY >= this.sectionOffsetTop[1] && this.scrollY < this.sectionOffsetTop[2]) {
        return 'コンテンツ2'
      } else if(this.scrollY >= this.sectionOffsetTop[2] && this.scrollY < this.sectionOffsetTop[3]) {
        return 'コンテンツ3'
      } else if(this.scrollY >= this.sectionOffsetTop[3] && this.scrollY < this.sectionOffsetTop[4]) {
        return 'コンテンツ4'
      } else if(this.scrollY >= this.sectionOffsetTop[4]) {
        return 'コンテンツ5'
      } else {
        return 'スクロールすると現在のコンテンツ名が表示されます'
      }
    }
  },
  mounted() {
    window.addEventListener('scroll', () => {
      this.pushScrollY();
    });
    window.addEventListener('resize', () => {
      this.pushScrollY();
    });
    this.pushElementOffsetTop();
  },
  methods: {
    pushScrollY() {
      this.scrollY = window.scrollY;
    },
    pushElementOffsetTop() {
      const targets = [
        'section_01',
        'section_02',
        'section_03',
        'section_04',
        'section_05'
      ];
      targets.forEach(target => {
        const element = document.getElementById(target)
        const offsetTop = Math.round(window.scrollY + element.getBoundingClientRect().top);
        this.sectionOffsetTop.push(offsetTop);
      });
    }
  }
});
              
            
!
999px

Console