<div class="slide-track">
 <div class="slide-bg"></div>
 <div class="slide-block"></div>
 <p class="slide-text">請按住滑塊，拖動(dòng)到最右邊</p>
</div>

function $(selectors) {
 return document.querySelector(selectors);
}

function _h(tagName, propMap = {}, text) {
 const ele = document.createElement(tagName);
 Object.keys(propMap).forEach(prop => ele.setAttribute(prop, propMap[prop]));
 if (text) {
  ele.appendChild(document.createTextNode(text));
 }
 return ele;
}

class SlideUnlock {
 constructor(el = "body", options = {}) {
  this.$el = $(el)
  this.$$isSuccess = false
  this.$options = { // 默認(rèn)配置
   tip: '請按住滑塊，拖動(dòng)到最右邊',
   unlockText: '驗(yàn)證成功',
   duration: 500,
   ...options
  }
 }

 init() {
  this.$$root = _h("div", { class: "slide-track" }) // 軌道
  this.$$bg = this.$$root.appendChild(_h("div", { class: "slide-bg" }))
  this.$$block = this.$$root.appendChild(
   _h("div", { class: "slide-block" }) // 滑塊
  )
  this.$$text = this.$$root.appendChild(
   _h("p", { class: "slide-text" }, this.$options.tip)
  )
  this.$el.insertBefore(this.$$root, this.$el.firstChild)
 }
}

class SlideUnlock {
 init() {
  /* ... */
  this.$$block.addEventListener(
   "mousedown",
   (this.$$handleMouseDown = this._handleMouseDown.bind(this)),
   false
  )
 }

 _handleMouseDown(e) {
  const downx = e.clientX

  e.target.addEventListener(
   "mousemove",
   (this.$$handleMouseMove = this._handleMouseMove.bind(this, downx)),
   false
  )
  e.preventDefault()
 }

 _handleMouseMove(downx, e) {}
}

_handleMouseMove(downx, e) {
 const info = this.$$block.getBoundingClientRect(),
  x = e.clientX,
  y = e.clientY,
  x1 = info.left,
  y1 = info.top,
  x2 = info.right,
  y2 = info.bottom,
  moveX = x - downx

 if (this.$$isSuccess) {
  return
 }
 if (moveX < 0) {
  return
 }
 if (x < x1 || x > x2 || y < y1 || y > y2) {
  // 當(dāng)鼠標(biāo)移開滑塊時(shí)取消移動(dòng)
  return
 }

 this.$$block.style.left = `${moveX}px` // 更新滑塊的我i之
 this.$$bg.style.width = `${moveX}px` // 同步增大背景元素的寬度

 // 當(dāng)滑塊滑動(dòng)的距離大于等于軌道除去滑塊寬度后的距離時(shí)表示已經(jīng)到達(dá)軌道的最右邊了
 if (moveX >= this.$$root.offsetWidth - (x2 - x1)) {
  this.$$isSuccess = true
  this.$$text.textContent = "驗(yàn)證成功"
  this.$$text.style.cssText = `color: #fff; left: 0; right: ${this.$$block.offsetWidth}px`
  this.$$block.classList.add("success")
 }
}

class SlideUnlock {
 init() {
  /* ... */
  document.addEventListener(
   "mouseup",
   (this.$$handleMouseUp = this._handleMouseUp.bind(this)),
   false
  )
 }

 _handleMouseDown(e) {
  /* ... */
  // 取消在手動(dòng)滑動(dòng)過程中的動(dòng)畫效果
  this.$$bg.style.transition = ""
  this.$$block.style.transition = ""
  /* ... */
 }

 _handleMouseUp(e) {
  this.$$block.removeEventListener(
   "mousemove",
   this.$$handleMouseMove,
   false
  )

  if (this.$$isSuccess) {
   return
  }

  // 給重置過程添加動(dòng)畫效果
  this.$$bg.style.transition = "width 1s ease"
  this.$$block.style.transition = "left 1s ease"

  this.$$block.style.left = 0
  this.$$bg.style.width = 0
 }
}

function bindEvents(events, handler, element = $("body")) {
 events.split(" ").forEach(event => {
  element.addEventListener(event, handler, false)
 })
}

function unbindEvents(events, handler, element = $("body")) {
 events.split(" ").forEach(event => {
  element.removeEventListener(event, handler, false)
 })
}

function bindEvents(events, handler, element = $("body")) {
 events.split(" ").forEach(event => {
  element.addEventListener(event, handler, false)
 })
}

function unbindEvents(events, handler, element = $("body")) {
 events.split(" ").forEach(event => {
  element.removeEventListener(event, handler, false)
 })
}

utils.throttle = function(method, context = {}, delay = 4, ...outParams) {
 return function(...innerParams) {
 clearTimeout(context.$$tId)
 context.$$tId = setTimeout(function() {
  method.apply(context, [...outParams, ...innerParams])
 }, delay)
 }
}

reset() {
 if (!this.$$isSuccess) {
  return
 }
 this.$$isSuccess = false
 this.$$bg.style.cssText =
  `transition: width ${this.$options.duration}ms ease; width: 0;`
 this.$$block.style.cssText =
  `transition: left ${this.$options.duration}ms ease; left: 0;`
 this.$$text.style.cssText =
  `color: #5f5f5f; left: ${this.$$block.offsetWidth}px; right: 0;`
 this.$$text.textContent = this.$options.tip
 this.$$block.classList.remove("success")
 this._bindEvents()
}

<body>
 <script src="slide-unlock/core.js"></script>
 <script>
  const slider = new SlideUnlock()
  slider.init()
 </script>
</body>