tab 栏切换 选项卡

<style>
* {
margin: 0;
padding: 0;
}

li {
list-style-type: none;
}

.tab {
width: 978px;
margin: 100px auto;
}

.tab_list {
height: 39px;
border: 1px solid #ccc;
background-color: #f1f1f1;
}

.tab_list li {
float: left;
height: 39px;
line-height: 39px;
padding: 0 20px;
text-align: center;
cursor: pointer;
}

.tab_list .current {
background-color: #c81623;
color: #fff;
}

.item_info {
padding: 20px 0 0 20px;
}

.item {
display: none;
}
</style>

<div class="tab">

        <div class="tab_list">

            <ul>

                <li class="current">商品介绍</li>

                <li>规格与包装</li>

                <li>售后保障</li>

                <li>商品评价（50000）</li>

                <li>手机社区</li>

            </ul>

        </div>

        <div class="tab_con">

            <div class="item" style="display: block;">

                商品介绍模块内容

            </div>

            <div class="item">

                规格与包装模块内容

            </div>

            <div class="item">

                售后保障模块内容

            </div>

            <div class="item">

                商品评价（50000）模块内容

            </div>

            <div class="item">

                手机社区模块内容

            </div>

        </div>

    </div>

    <script>

        // 模拟京东tab栏切换 点谁谁背景色和字体颜色发生变化

        // 获取tab_list下的所有li

        var tab = document.getElementsByClassName('tab_list')[0]

        var lis = tab.getElementsByTagName('li')

        // 获取tab_con的所有div

        var con = document.getElementsByClassName('tab_con')[0]

        var dvs = con.getElementsByTagName('div')

        for (var i = 0; i < lis.length; i++) {

            lis[i].setAttribute('myindex', i)

            // 为每一个li绑定点击事件

            lis[i].onclick = function () {

                // 点击的时候移除所有元素的class属性

                for (var j = 0; j < lis.length; j++) {

                    // 把className 置为空

                    lis[j].className = ''

                }

                // 为当前点击元素添加class

                this.className = 'current'

                // 点击的时候切换下面的div

                // 干掉其它div

                for (var i = 0; i < dvs.length; i++) {

                    dvs[i].style.display = 'none'

                }

                // 获取点击的li设置的自定义属性myindex

                var index = this.getAttribute('myindex')

                // console.log(index);

                // 让下标和点击的li下标相同的元素显示即可

                dvs[index].style.display = 'block'

            }

        }

    </script>