vue图片滑动练习

写出来感觉像胶片，旧旧的感觉

<template>
  <div id="app">
    <div id="box" ref="box" @mouseover="handleBoxOver">
      <div class="list" ref="list">
        <ul :style="styleObject" ref="ul">
          <li ref="li">
            <img src="../assets/lesson8/1.jpg" />
            <p>iPhone 4</p>
          </li>
          <li>
            <img src="../assets/lesson8/2.jpg" />
            <p>iPad 2</p>
          </li>
          <li>
            <img src="../assets/lesson8/3.jpg" />
            <p>iPod touch</p>
          </li>
          <li>
            <img src="../assets/lesson8/4.jpg" />
            <p>iPod classic</p>
          </li>
          <li>
            <img src="../assets/lesson8/5.jpg" />
            <p>iPod shuffle</p>
          </li>
          <li>
            <img src="../assets/lesson8/6.jpg" />
            <p>iPod nano</p>
          </li>
          <li>
            <img src="../assets/lesson8/7.jpg" />
            <p>MacBook Air</p>
          </li>
          <li>
            <img src="../assets/lesson8/8.jpg" />
            <p>MacBook Pro</p>
          </li>
          <li>
            <img src="../assets/lesson8/9.jpg" />
            <p>Mac mini</p>
          </li>
          <li>
            <img src="../assets/lesson8/10.jpg" />
            <p>Mac Pro</p>
          </li>
        </ul>
      </div>
      <div class="scrollBar">
        <div
          class="barL"
          ref="barL"
          :class="{ barLStop: isLStop }"
          @mouseover="handleBarLOver"
          @mouseout="handleOut"
          @keyup="handleOut"
        ></div>
        <div class="barM" ref="barM" @click="hadlebarMClick">
          <div
            class="bar"
            @mousedown="handleBarDown"
            ref="bar"
            @click="handleBarClick"
          >
            <div class="l"></div>
            <div class="r"></div>
          </div>
        </div>
        <div
          class="barR"
          ref="barR"
          :class="{ barRStop: isRStop }"
          @mouseover="handleBarROver"
          @mouseout="handleOut"
          @keyup="handleOut"
        ></div>
      </div>
    </div>
    <dl id="desc">
      <dt>功能说明：</dt>
      <dd>① 拖动滚动条，图片列表缓冲滑动至目标点；</dd>
      <dd>② 滚动条两端鼠标移入自动滑动；</dd>
      <dd>③ 滚动条滑动到两端自动更换为停止标识；</dd>
      <dd>④ 点击滚动条黑色背景区，滚动条及图片列表缓冲滑动至目标点；</dd>
      <dd>⑤ 支持键盘左右键；</dd>
      <dd>⑥ 支持鼠标滚轮。</dd>
      <dd class="ta-r">大芮芮</dd>
    </dl>
  </div>
</template>
<script>
function getStyle(obj, attr) {
  return parseFloat(
    obj.currentStyle
      ? obj.currentStyle[attr]
      : getComputedStyle(obj, null)[attr]
  )
}
export default {
  data() {
    return {
      oBox: null,
      oList: null,
      oUl: null,
      oLi: null,
      oBarL: null,
      oBarM: null,
      oBarR: null,
      oBar: null,
      maxL: 0,
      iMarginRight: 0,
      tiemr: null,
      iScale: 0,
      disX: 0,
      isLStop: false,
      isRStop: false,
      li_ 0,
      bar_left: 0
    }
  },
  computed: {
    styleObject() {
      var width = (this.li_width + this.iMarginRight) * 10 + 'px'
      return {
         width
      }
    }
  },
  methods: {
    init() {
      this.oBox = this.$refs.box
      this.oList = this.$refs.list
      this.oUl = this.$refs.ul
      this.oLi = this.$refs.li
      this.oBarL = this.$refs.barL
      this.oBarM = this.$refs.barM
      this.oBarR = this.$refs.barR
      this.oBar = this.$refs.bar
      this.maxL = this.oBarM.offsetWidth - this.oBar.offsetWidth
      this.iMarginRight = getStyle(this.oLi, 'marginRight')
      this.li_width = this.$refs.li.offsetWidth
      this.bar_left = this.$refs.bar.offsetLeft

      this.isStop()
    },
    handleBarDown(e) {
      var _this = this
      this.disX = e.clientX - this.oBar.offsetLeft
      document.onmousemove = function(e) {
        var iL = e.clientX - _this.disX
        iL <= 0 && (iL = 0)
        iL >= _this.maxL && (iL = _this.maxL)
        _this.oBar.style.left = iL + 'px'
        _this.iScale = iL / _this.maxL
        return false
      }
      document.onmouseup = function() {
        _this.startMove(
          _this.oUl,
          parseInt(
            (_this.oList.offsetWidth +
              _this.iMarginRight -
              _this.oUl.offsetWidth) *
              _this.iScale
          )
        )
        _this.isStop()
        document.onmousemove = null
        document.onmouseup = null
      }
      return false
    },
    handleBarClick(e) {
      e.cancelBubble = true
    },
    handleBarLOver() {
      var _this = this
      var iSpeed = -5
      this.tiemr = setInterval(function() {
        _this.togetherMove(getStyle(_this.oBar, 'left') + iSpeed, 1)
      }, 30)
    },
    handleBarROver() {
      var _this = this
      var iSpeed = 5
      this.tiemr = setInterval(function() {
        _this.togetherMove(getStyle(_this.oBar, 'left') + iSpeed, 1)
      }, 30)
    },
    handleOut() {
      clearInterval(this.tiemr)
    },
    hadlebarMClick(e) {
      var iTarget =
        e.clientX -
        this.oBox.offsetLeft -
        this.oBarM.offsetLeft -
        this.oBar.offsetWidth / 2
      this.togetherMove(iTarget)
    },
    handleBoxOver() {
      var _this = this
      function mouseWheel(e) {
        var delta = e.wheelDelta ? e.wheelDelta : -e.detail * 40
        var iTarget = delta > 0 ? -50 : 50
        _this.togetherMove(_this.oBar.offsetLeft + iTarget)
      }
      this.oBox.addEventListener('mousewheel', mouseWheel)
      this.oBarM.addEventListener('DOMMouseScroll', mouseWheel)
    },
    togetherMove(iTarget, buffer) {
      var _this = this
      if (iTarget <= 0) {
        this.tiemr && clearInterval(this.tiemr)
        iTarget = 0
      } else if (iTarget >= this.maxL) {
        this.tiemr && clearInterval(this.tiemr)
        iTarget = this.maxL
      }
      this.iScale = iTarget / this.maxL
      this.startMove(
        this.oUl,
        parseInt(
          (this.oList.offsetWidth + this.iMarginRight - _this.oUl.offsetWidth) *
            this.iScale
        ),
        function() {
          _this.isStop()
        },
        buffer
      )
      this.startMove(
        this.oBar,
        iTarget,
        function() {
          _this.isStop()
        },
        buffer
      )
    },
    isStop() {
      this.oBarL.className = 'barL'
      this.oBarR.className = 'barR'
      var _this = this
      switch (this.oBar.offsetLeft) {
        case 0:
          _this.oBarL.classList.contains('barLStop') ||
            this.oBarL.classList.add('barLStop')
          break
        case _this.maxL:
          _this.oBarR.classList.contains('barRStop') ||
            _this.oBarR.classList.add('barRStop')
          break
      }
    },
    startMove(obj, iTarget, fnEnd, buffer) {
      var _this = this
      clearTimeout(obj.timer)
      obj.timer = setInterval(function() {
        _this.doMove(obj, iTarget, fnEnd, buffer)
      }, 25)
    },
    doMove(obj, iTarget, fnEnd, buffer) {
      var iLeft = getStyle(obj, 'left')
      var iSpeed = (iTarget - iLeft) / (buffer || 5)
      iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed)
      iLeft == iTarget
        ? (clearInterval(obj.timer), fnEnd && fnEnd())
        : (obj.style.left = iLeft + iSpeed + 'px')
    }
  },
  mounted() {
    this.init()
    this.isStop()
  }
}
</script>
<style>
body,
div,
ul,
li,
p {
  margin: 0;
  padding: 0;
}
body {
  background: #3e3e3e;
  font: 14px/1.5 5fae8f6f96c59ed1;
}
#box {
  width: 600px;
  margin: 20px auto;
}
.list {
  position: relative;
  width: 600px;
  height: 144px;
  margin-bottom: 10px;
  overflow: hidden;
  border-radius: 8px;
}
.list ul {
  position: absolute;
  top: 0;
  left: 0;
  height: 144px;
}
.list li {
  display: inline;
  float: left;
  width: 144px;
  height: 144px;
  list-style: none;
  background: #000;
  margin-right: 8px;
  border-radius: 8px;
}
.list li img {
  float: left;
  width: 124px;
  height: 100px;
  border-radius: 5px;
  margin: 10px 0 0 10px;
}
.list li p {
  float: left;
  color: #fff;
  width: 100%;
  text-align: center;
  line-height: 34px;
}
.scrollBar {
  position: relative;
  height: 19px;
  background: #0a0a0a;
  overflow: hidden;
}
.scrollBar .barL,
.scrollBar .barR,
.scrollBar .barLStop,
.scrollBar .barRStop {
  position: absolute;
  top: 0;
  width: 28px;
  height: 19px;
  cursor: pointer;
  background: url(../assets/lesson8/04.gif) no-repeat;
  /* background-color: #545454; */
}
.scrollBar .barL {
  left: 0;
}
.scrollBar .barR {
  right: 0;
  background-position: right 0;
}
.scrollBar .barLStop {
  left: 0;
  background-position: 0 -19px;
  cursor: default;
}
.scrollBar .barRStop {
  right: 0;
  background-position: right -19px;
  cursor: default;
}
.scrollBar .barM {
  position: relative;
  height: 15px;
  border: 1px so #545454;
  border-width: 1px 0;
  margin: 0 28px;
  padding: 1px 0;
  z-index: 1;
  cursor: pointer;
}
.scrollBar .bar {
  position: absolute;
  top: 1px;
  left: 0;
  width: 150px;
  height: 15px;
  cursor: e-resize;
  background: url(../assets/lesson8/05.gif) repeat-x;
  /* background-color: #545454; */
}
.scrollBar .bar .l,
.scrollBar .bar .r {
  position: absolute;
  top: 0;
  width: 6px;
  height: 15px;
  background: url(../assets/lesson8/05.gif) no-repeat;
  /* background-color: #545454; */
}
.scrollBar .bar .l {
  left: -6px;
}
.scrollBar .bar .r {
  right: -6px;
  background-position: right 0;
}
#desc {
  color: #ccc;
  width: 578px;
  padding: 10px;
  margin: 0 auto;
  line-height: 2;
  border: 1px dashed #666;
}
#desc dd {
  margin-left: 2rem;
}
.ta-r {
  text-align: right;
}
</style>

效果如图

功能说明：① 拖动滚动条，图片列表缓冲滑动至目标点；② 滚动条两端鼠标移入自动滑动；③ 滚动条滑动到两端自动更换为停止标识；④ 点击滚动条黑色背景区，滚动条及图片列表缓冲滑动至目标点；⑤ 支持键盘左右键；⑥ 支持鼠标滚轮。