vuetab滚动到一定高度,固定在顶部,点击tab切换不同的内容操作

  
   

    
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data(){
  return:{
    whether:false,
    curId:0
  }
}

  handleScroll() {
   var scrollTop =
    window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
   // console.log(scrollTop)
   if(scrollTop>329){
    this.whether = true;
   }else{
    this.whether = false;
   }
  },

.tab__div {
  width: 100%;
  height: 102px;
  position: relative;
  padding-top: 36px;
  background-color: #fff;
  .tab__list {
    display: flex;
    .tab__item {
      flex: 1;
      font-size: 32px;
    }
    .tab__item-current {
      font-weight: 700;
    }
  }
  .active__line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 187.5px;
    height: 5px;
    background-color: #4B8FFB;
    transition: all 300ms;
  }
}

export default {
  name: 'TabModule',
  props: {
    prop: {
      type: Object
    }
  },
  data () {
    return {
      scrolltop: null,
      dom: null,
      domobj: {} // 各个dom的页面位置
    }
  },
  computed: {
    tabStyle () {
      return function (params) {
        return this.prop.attr.tab_content[params].tab_style || ''
      }
    }
  },
  mounted () {
    this.onWatchScroll()
    // 这里首次进入页面当前选中项为第一个
    document.querySelectorAll('.tab__item')[0].style = this.prop.attr.cur_tab_style &＃63; this.prop.attr.cur_tab_style : ''
  },
  methods: {
    // 获取各个dom的页面位置
    getDomsObj () {
      this.domobj.dom1 = document.querySelectorAll(`#${this.prop.attr.tab_content[0].anchor_point}`)[0].offsetTop
      this.domobj.dom2 = document.querySelectorAll(`#${this.prop.attr.tab_content[1].anchor_point}`)[0].offsetTop
      this.domobj.dom3 = document.querySelectorAll(`#${this.prop.attr.tab_content[2].anchor_point}`)[0].offsetTop
      this.domobj.dom4 = document.querySelectorAll(`#${this.prop.attr.tab_content[3].anchor_point}`)[0].offsetTop
    },
    // 计算当前选中滑动块儿的滑动距离和当前选中项
    computerSlide (val) {
      let tablist = document.querySelectorAll('.tab__item')
      for (let i = 0; i  {
        // 由于在created()或者mounted()钩子函数中获取到的dom位置不对，在滑动中获取dom的页面位置
        this.getDomsObj()
        this.scrolltop = document.documentElement.scrollTop || document.body.scrollTop || window.pageYOffset
        // 滑动根据滚动距离来计算当前可是区域的选中项
        this.onScrollPage()
        // 自定义吸顶效果
        if (this.scrolltop > tabmain.offsetTop) {
          tabdiv.style.position = 'fixed'
          tabdiv.style['z-index'] = 99
        } else {
          tabdiv.style.position = 'relative'
          tabdiv.style['z-index'] = 0
        }
      }
    },
    onScrollPage () {
      let tab = document.querySelectorAll('.tab__div')[0]
      if (this.scrolltop > this.domobj.dom1 && this.scrolltop <(this.domobj.dom2 - tab.offsetHeight * 2)) {
        this.computerSlide(0)
      } else if (this.scrolltop > (this.domobj.dom2 - tab.offsetHeight * 2) && this.scrolltop  (this.domobj.dom3 - tab.offsetHeight * 2) && this.scrolltop <(this.domobj.dom3 + tab.offsetHeight * 2)) {
        this.computerSlide(2)
      } else if (this.scrolltop > (this.domobj.dom4 - tab.offsetHeight * 10) && this.scrolltop 

import TabModule from '../../components/TabModule.vue'
export default {
  components: {
    TabModule
  },
  data () {
    return {
      tabattributes: {
        box_style: "margin-top: 10px;",         
        attr: {      
          cur_tab_style: "font-weight: 700;", 
          cur_slide_style: "",
          tab_content: [{
            tab_menu: "控件1",       
            anchor_point: "DomPoint1",
            tab_style: "" 
          }, {
            tab_menu: "控件2",       
            anchor_point: "DomPoint2",  
            tab_style: "" 
          }, {
            tab_menu: "控件3",       
            anchor_point: "DomPoint3",  
            tab_style: "" 
          }, {
            tab_menu: "控件4",       
            anchor_point: "DomPoint4", 
            tab_style: "" 
          }]
        }
      },
      fordiv: ['页面控件1', '页面控件2', '页面控件3', '页面控件4']
    }
  }
}