原生JavaScript实现的无缝滚动功能详解

<div class="box" id="box">
  <ul class="J_XSlide list">
    <li class="J_tabContent"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="/UploadFiles/2021-04-02/1.jpg">

二、CSS部分


<style>
  * {
    margin: 0;
    padding: 0;
  }
  ul li {
    list-style: none;
  }
  .clearfix {
    zoom: 1;
  }
  .clearfix:after {
    display: block;
    clear: both;
    content: '';
  }
  .box {
    width: 1226px;
    height: 460px;
    overflow: hidden;
    position: relative;
    margin: 20px auto 0;
  }
  .box .list {
    position: relative;
    left: 0;
    height: 460px;
  }
  .box .list li img,
  .box .list li {
    float: left;
    width: 1226px;
    height: 460px;
  }
  .box .tabs {
    position: absolute;
    right: 5px;
    bottom: 5px;
    z-index: 99999;
   }
  .box .tabs .tab {
    float: left;
    width: 6px;
    height: 6px;
    border: 2px solid #f47500;
    border-radius: 100%;
    margin-right: 10px;
    cursor: pointer;
    background: #fcf2cf;
    font-family: arial;
  }
  .box .tabs .tab:hover,
  .box .tabs .cur {
    border: 2px solid #1227e4;
    background: #26c776;
  }
  .box .btn {
    position: absolute;
    width: 30px;
    height: 70px;
    top: 50%;
    margin-top: -35px;
    z-index: 20;
    background-color: rgba(0, 0, 0, 0.2);
    font-size: 30px;
    color: #fff;
    text-align: center;
    line-height: 70px;
  }
  .box:hover .btn {
    background-color: rgba(0, 0, 0, 0.6);
  }
  .box .btnl {
    left: 10px;
  }
  .box .btnr {
    right: 10px;
  }
</style>




三、JavaScript部分
3.1 base.js


  var GLOBAL = {};
  // 定义命名空间函数
  GLOBAL.namespace = function(str) {
    var arr = str.split("."),
      o = GLOBAL;
    for(i = (arr[0] === "GLOBAL") "Dom");
  // 获取className 第一个参数必须的（class名）、第二个参数父容器，缺省为body节点、第三个参数为DOM节点标签名
  GLOBAL.Dom.getElementsByClassName = function(str, root, tag) {
    if(root) {
      root = typeof root === 'string' "htmlcode">

function getStyle(obj, attr) {
  return obj.currentStyle "htmlcode">

  (function() {
    var oBox = document.getElementById('box');
    var oXSlide = GLOBAL.Dom.getElementsByClassName('J_XSlide', oBox)[0];
    var li = oXSlide.getElementsByTagName('li');
    var liTabs = GLOBAL.Dom.getElementsByClassName('tabs', oBox)[0].getElementsByTagName('li');
    var iNow = 0;
    function tab() {
      var timer = null;
      var playTime = 3000;
      var btn = GLOBAL.Dom.getElementsByClassName('btn', oBox);
      oXSlide.style.width = li.length * li[0].offsetWidth + 'px';
      for(var i = 0, len = liTabs.length; i < len; i++) {
        liTabs[i].index = i;
        GLOBAL.Event.addHandler(liTabs[i], 'mouseover', function() {
          iNow = this.index;
          showItem(iNow);
        });
      }
      GLOBAL.Event.addHandler(btn[0], 'click', moveLeft);
      GLOBAL.Event.addHandler(btn[1], 'click', moveRight);
      timer = setInterval(autoPlay, playTime);
      function autoPlay() {
        moveRight();
      }
      GLOBAL.Event.addHandler(oBox, 'mouseover', function() {
        clearInterval(timer);
      });
      GLOBAL.Event.addHandler(oBox, 'mouseout', function() {
        timer = setInterval(autoPlay, playTime);
      });
    }
    // 选项卡
    function showItem(n) {
      for(var i = 0, len = liTabs.length; i < len; i++) {
        liTabs[i].className = 'tab';
      }
      if(n == liTabs.length) {
        liTabs[0].className = 'tab cur';
      }
      else {
        liTabs[n].className = 'tab cur';
      }
      startMove(oXSlide, {'left': -n * li[0].offsetWidth});
    }
    function moveLeft() {
      iNow--;
      if(iNow == -1) {
        oXSlide.style.left = -liTabs.length * li[0].offsetWidth + 'px';
        iNow = liTabs.length - 1;
      }
      showItem(iNow);
    }
    function moveRight() {
      iNow++;
      if(iNow == li.length) {
        oXSlide.style.left = 0;
        iNow = 1;
      }
      showItem(iNow);
    }
    tab();
  })();




更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript切换特效与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript动画特效与技巧汇总》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》、《JavaScript遍历算法与技巧总结》及《JavaScript数学运算用法总结》
希望本文所述对大家JavaScript程序设计有所帮助。

            
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