js使用排他思想实现导航栏的切换

导航栏的切换

html代码如下:

<div class="box">        <ul>            <li class="current">鞋子</li>            <li>袜子</li>            <li>帽子</li>            <li>裤子</li>            <li>裙子</li>        </ul>        <span class="show">鞋子</span>        <span>袜子</span>        <span>帽子</span>        <span>裤子</span>        <span>裙子</span>    </div>    <div class="box">        <ul>            <li class="current">鞋子</li>            <li>袜子</li>            <li>帽子</li>            <li>裤子</li>            <li>裙子</li>        </ul>        <span class="show">鞋子</span>        <span>袜子</span>        <span>帽子</span>        <span>裤子</span>        <span>裙子</span>    </div>

css样式:

<style>    * {        padding: 0;        margin: 0;    }    .box {        width: 500px;        height: 400px;        border: 1px solid #ccc;        margin: 100px auto;        overflow: hidden;    }    ul {        width: 600px;        height: 40px;        margin-left: -1px;        list-style: none;    }    li {        float: left;        width: 101px;        height: 40px;        text-align: center;        font: 600 18px/40px "simsun";        background-color: pink;        cursor: pointer;    }    span {        display: none;        width: 500px;        height: 360px;        background-color: yellow;        text-align: center;        font: 700 150px/360px "simsun";    }    .show {        display: block;    }    .current {        background-color: yellow;    }</style>

js代码如下:

<script>    //首先获取所有的li    var box = document.getElementsByClassName("box");    //循环调用函数 有几个box,调用几次 互不影响    for(var i = 0;i<box.length;i++){        fn(box[i]);    }    function fn(ele){        var liArr = ele.getElementsByTagName("li");        var spanArr = ele.getElementsByTagName("span");        for(var i = 0;i < liArr.length;i++){            //为每个li绑定索引值            liArr[i].index = i;            liArr[i].onmouseover = function(){                //为所有的li标签添加鼠标移入事件  排他思想，干掉所有人，设置自己                for(var j = 0;j<liArr.length;j++){                    liArr[j].className = "";                    spanArr[j].className = "";                }                //设置当前鼠标移入的类名为current                this.className = "current";                //设置当前的索引值所对应的span标签的类名为show                spanArr[this.index].className = "show";            }        }    }</script>

排他思想:

干掉所有人，设置我自己，先将所有人全设置为"",然后再设置当前的值

运行结果如下: