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Share a piece of native JavaScript code to achieve a beautiful Taobao carousel effect example

怪我咯Original: 2017-05-29 10:34:501434browse

This article mainly introduces the native JavaScript to realize the exquisite Taobao carousel chart effect. It combines the complete example form with a detailed analysis of the relevant HTML layout, css and js core function code of JavaScript to realize the Taobao carousel chart function, and comes with the demo source code. For readers’ download reference, friends in need can refer to

. This article describes the Taobao carousel image effect implemented by native JavaScript. Share it with everyone for your reference, the details are as follows:

Carousel chart is the only way for us to learn native js

It contains the application of many basic knowledge, such as the use of this, DOM Operation, as well as the use and clearing of setInterval, floating and positioning, etc., it is a good test of whether our basic knowledge is solid.

Without further ado, let’s go directly to the picture

##HTML code is as follows:

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title>淘宝轮播图</title>
  <link rel="stylesheet" href="css/initialize.css" rel="external nofollow" />
  <link rel="stylesheet" href="css/tblunbotu.css" rel="external nofollow" />
</head>
<body>
<p id="container" class="clearFix">
  <p id="list" class="clearFix" style="left: -520px">
    <img src="img/5.jpg" alt=""/>
    <img src="img/1.jpg" alt=""/>
    <img src="img/2.jpg" alt=""/>
    <img src="img/3.jpg" alt=""/>
    <img src="img/4.jpg" alt=""/>
    <img src="img/5.jpg" alt=""/>
    <img src="img/1.jpg" alt=""/>
  </p>
  <p id="buttons" class="clearFix">
    <span class="on"></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
  </p>
  <a href="javascript:;" rel="external nofollow" rel="external nofollow" id="prev" class="arrow"><</a>
  <a href="javascript:;" rel="external nofollow" rel="external nofollow" id="next" class="arrow">></a>
</p>
<script type="text/javascript" src="js/tblunbotu.js"></script>
</body>
</html>

CSS style is as follows:

/*
  第一步：设置外部框的样式
  第二步: 设置图片框的样式
  第三步: 设置箭头的样式
  第四步: 设置小圆点的样式
*/
#container {
  margin: 50px auto;
  position: relative;
  width: 520px;
  height: 280px;
  overflow: hidden;
}
#list {
  position: absolute;
  z-index: 1;
  width: 3640px;
}
#list img {
  float: left;
  width: 520px;
  height: 280px;
}
#buttons {
  height: 10px;
  width: 100px;
  position: absolute;
  left: 0;/*设置水平垂直居中*/
  right: 0;/*设置水平垂直居中*/
  margin: 0 auto;/*设置水平垂直居中*/
  bottom: 20px;
  z-index: 2;
}
#buttons span {
  float: left;
  margin-right: 5px;
  width: 10px;
  height: 10px;
  border: 1px solid #cccccc;
  border-radius: 50%;
  background: #333;
  cursor: pointer;
}
#buttons .on {
  background: orangered;
}
.arrow {
  width: 40px;
  height: 40px;
  display: none;
  position: absolute;
  top: 0; /*设置水平垂直居中*/
  bottom: 0; /*设置水平垂直居中*/
  margin: auto 0; /*设置水平垂直居中*/
  font-size: 36px;
  font-weight: bold;
  line-height: 39px;
  text-align: center;
  color: #fff;
  background-color: RGBA(0, 0, 0, .3);
  cursor: pointer;
  z-index: 2;
}
.arrow:hover{
  background-color: RGBA(0, 0, 0, .7);
}
#container:hover .arrow {
  display: block;
}
#prev{
  left: 10px;
}
#next{
  right: 10px;
}

##javascript code

is as follows

/**
 * Created by zhm on 17.1.15.
 */
  /*
  *知识点：
  *  this使用
  *  DOM事件
  *  定时器
  *
  *  思路：
  *  （1）设置它左右移动
  *    问题：传入数字为NAN??
  *    解决：在页面中增加属性style：left:0
  *  （2）平滑移动（移动时间固定，每次移动的距离不一样）
  *    问题：连续点击出现晃动？---设置标志位
  *       出现空白页？？--- 第一张图片前加上最后一张，最后一张图片前加上第一张
  *               在类list的标签中增加属性style：left:-520px;
  *               设置无限滚动判断
  *
  *  （3）设置小圆点
  *    首先将所有的类置为空，当前类置为on
  *    绑定小圆点和图片
  *    绑定小圆点和左右箭头
  *    设置定时器，鼠标划上去停止，移开自动轮播
  *
  * */
  //1.获取元素
  var container = document.getElementById("container");
  var list = document.getElementById("list");
  var prev = document.getElementById("prev");
  var next = document.getElementById("next");
  var buttons = document.getElementById(&#39;buttons&#39;).getElementsByTagName(&#39;span&#39;);
  var timer = null;
  var timer2 = null;
  var flag = true;
  var index =0;
  //2.设置函数
  function moveImg(dis) {
    var time = 400;//运动的总时间
    var eachTime = 10;//每次小移动的时间
    var eachDis = dis/(time/eachTime);//每次小移动的距离
    var newWeizhi = parseInt(list.style.left) + dis;//新位置
    flag = false;
    function eachMove(){
      if(dis > 0 && parseInt(list.style.left)< newWeizhi || dis < 0 && parseInt(list.style.left)>newWeizhi){
        list.style.left = parseInt(list.style.left) + eachDis + &#39;px&#39;;
      }else {
        flag = true;
        clearInterval(timer);
        list.style.left = newWeizhi + &#39;px&#39;;
        //无限滚动判断
        if (newWeizhi == 0) {
          list.style.left = -2600 + &#39;px&#39;;
        }
        if (newWeizhi == -3120) {
          list.style.left = -520 + &#39;px&#39;;
        }
      }
    }
    timer = setInterval(eachMove, 10);
  }
  //3.设置点击切换图片
  next.onclick = function () {
    if(!flag) return;
    moveImg(-520);
    //绑定箭头和小圆点
    if (index == 4) {
      index = 0;
    } else {
      index++;
    }
    buttonsShow();
  };
  prev.onclick = function () {
    if(!flag) return;
    moveImg(520);
  //绑定箭头和小圆点
    if (index == 0) {
      index = 4;
    } else {
      index--;
    }
    buttonsShow();
  };
  //4.设置小圆点的绑定
  function buttonsShow() {
    //将之前的小圆点的样式清除
    for (var i = 0; i < buttons.length; i++) {
      if (buttons[i].className == "on") {
        buttons[i].className = "";
        break;
      }
    }
    buttons[index].className = "on";
  }
  for(var i = 0 ;i<buttons.length;i++){
    buttons[i].value = i;
    //使用自执行函数解决i的赋值问题
    (function(){
      buttons[i].onclick = function(){
        if(this.value == index) return;
        var offset = (this.value - index)* -520;
        moveImg(offset);
        index = this.value;
        buttonsShow();
      }
    })();
  }
  //5.设置自动轮播
  timer2 = setInterval(next.onclick,1500);
  container.onmouseover = function(){
    clearInterval(timer2);
  };
  container.onmouseout = function(){
    timer2 = setInterval(next.onclick,1000);
  };

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