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How to implement subtitle scrolling in Javascript

藏色散人
藏色散人Original
2021-06-18 11:49:274636browse

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.

How to implement subtitle scrolling in Javascript

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

Effect

How to implement subtitle scrolling in Javascript

Principle

The container is set to a fixed width, the excess part is hidden, and the scrolling part is absolutely positioned And change the position through the timer

realize

    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(&#39;启动&#39;)
      var tag1 = document.querySelector(&#39;.scroll>span&#39;)
      var tag2 = tag1.nextSibling
      var fun = function () {
        tag1.style.left = x + &#39;px&#39;
        tag2.style.left = (x + LEN) + &#39;px&#39;
        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(&#39;.scroll>span&#39;)
      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) + &#39;px&#39;
      el.parentElement.appendChild(el2)
      el.addEventListener(&#39;mouseenter&#39;, function (e) {
        clearInterval(scrollTime)
      })
      el.addEventListener(&#39;mouseleave&#39;, function (e) {
        roll()
      })
    }
Recommended study: "

javascript Advanced Tutorial"

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