How to implement subtitle scrolling in Javascript

How to implement subtitle scrolling in Javascript: first create HTML and css files; then set the container to a fixed width and hide the excess part; finally create a js file and change the position through a timer.

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

How to implement subtitle scrolling in Javascript?

Native js to realize subtitle scrolling

##Use css and native js to realize subtitle scrolling Effect, seamless connection

html part

• <p class="scroll">
      <span>这里是要现实的滚动内容......</span>
   </p>

css part

• .scroll {
    width: 400px;
    height: 23px;
    white-space: nowrap;
    overflow: hidden;
    margin-left: 40px;
    position: relative;
  }
  .scroll > span {
    position: absolute;
  }

js part

• // 字幕滚动变量
  var scrollTime = null
  var LEN = 400 // 一个完整滚动条的长度
  var x = 0
  // 启动滚动定时器
  function roll () {
    console.log('启动')
    var tag1 = document.querySelector('.scroll>span')
    var tag2 = tag1.nextSibling
    var fun = function () {
      tag1.style.left = x + 'px'
      tag2.style.left = (x + LEN) + 'px'
      x = x - 5
      if ((x + LEN) === 0) {
        x = 0
      }
    }
    if (scrollTime) {
      clearInterval(scrollTime)
    }
    scrollTime = setInterval(fun, 300)
  }
  // 绑定鼠标事件
  function bindMouseEvent () {
    var el = document.querySelector('.scroll>span')
    var el2 = el.cloneNode(true)
    LEN = el.clientWidth + 100 // 动态修改滚动条的长度，避免文字过多重叠
    el2.style.left = (x + LEN) + 'px'
    el.parentElement.appendChild(el2)
    el.addEventListener('mouseenter', function (e) {
      clearInterval(scrollTime)
    })
    el.addEventListener('mouseleave', function (e) {
      roll()
    })
  }

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