小米移动端页面练习---重点：导航栏点击下箭头内容的切换以及样式,高亮显示的实现

效果图

1.html

<div>
        <header>
            <div class="header-ad">
                <img src="./images/ad.png" alt="" srcset="">
            </div>
            <div class="header-two-section">
                <div class="logo">
                    <div class="logo-img">
                        <img src="./images/icon-header-logo.png" alt="">
                    </div>
                    <div class="search">
                        <div class="search-img">
                            <img src="./images/search.png" alt="" srcset="">
                        </div>
                        <div class="search-input">
                            搜索商品名称
                        </div>
                    </div>
                    <div class="user-img">
                        <img src="./images/icon-user.23496a0116.png" alt="">
                    </div>
                </div>
                <div class="hearder-nav">
                    <div class="hearder-five-nav">
                        <div class="hearder-nav-active">推荐</div>
                        <div>智能</div>
                        <div>电视</div>
                        <div>家电</div>
                        <div>笔记本</div>
                    </div>

                    <!-- 全部 -->
                    <div class="contaniner">
                        <div class="contaniner-text">全部</div>
                        <span class="active">推荐</span>
                        <span>智能</span>
                        <span>电视</span>
                        <span>家电</span>
                        <span>笔记本</span>
                    </div>
                    <div class="hearder-nav-img">
                        <div class="arrow"></div>
                    </div>
                </div>
            </div>
            <div class="header-three-section">
                <div class="three-section-img">
                    <img src="./images/main1.webp" alt="" srcset="">
                    <img src="./images/main2.webp" alt="" srcset="">
                    <img src="./images/main3.webp" alt="" srcset="">
                    <img src="./images/main1.webp" alt="" srcset="">
                    <img src="./images/main2.webp" alt="" srcset="">
                </div>
                <div class="three-section-img">
                    <img src="./images/main3.webp" alt="" srcset="">
                    <img src="./images/main1.webp" alt="" srcset="">
                    <img src="./images/main2.webp" alt="" srcset="">
                    <img src="./images/main3.webp" alt="" srcset="">
                    <img src="./images/main1.webp" alt="" srcset="">
                </div>
            </div>
            <div class="line">

            </div>
        </header>
        <main>
            <div class="main-section">
                <div class="main-section-img">
                    <img src="./images/a1.webp" alt="" srcset="">
                </div>
                <div class="main-section-two-img">
                    <img src="./images/a2.webp" alt="" srcset="">
                    <img src="./images/a3.webp" alt="" srcset="">
                </div>
            </div>
            <div class="line">

            </div>
            <div class="box">
                <div class="main-image">
                    <div>
                        <img src="./images/a6.jpg" alt="" srcset="">
                    </div>
                    <div>
                        <div>小米13</div>
                        <div>小米13</div>
                        <div class="red">￥5999起</div>
                        <div class="btn">立即购买</div>
                    </div>
                </div>
                <div class="main-image">
                    <div>
                        <img src="./images/a6.jpg" alt="" srcset="">
                    </div>
                    <div>
                        <div>小米1313333</div>
                        <div>小米13</div>
                        <div class="red">￥5999起</div>
                        <div class="btn">立即购买</div>
                    </div>
                </div>
            </div>

        </main>
        <footer>
            <div class="footer-section">
                <div>
                    <img src="./images/tarbar.png" alt="" srcset="">
                </div>
                <div>
                    首页
                </div>
            </div>
            <div class="footer-section">
                <div>
                    <img src="./images/tarbar.png" alt="" srcset="">
                </div>
                <div>
                    首页
                </div>
            </div>
            <div class="footer-section">
                <div>
                    <img src="./images/tarbar.png" alt="" srcset="">
                </div>
                <div>
                    首页
                </div>
            </div>
            <div class="footer-section">
                <div>
                    <img src="./images/tarbar.png" alt="" srcset="">
                </div>
                <div>
                    首页
                </div>
            </div>
            <div class="footer-section">
                <div>
                    <img src="./images/tarbar.png" alt="" srcset="">
                </div>
                <div>
                    首页
                </div>
            </div>
        </footer>
    </div>

2.script

<script>
        let arrow = document.querySelector('.arrow');
        let Height = document.querySelector('.header-two-section');
        let contaniner = document.querySelector('.contaniner')
        let hearderNav = document.querySelector('.hearder-five-nav')

        contaniner.style.display = 'none'
        let flag = true
        //高亮显示,排他,利用双重forEach,先去除active,再给点击内容单独添加active
        let span = document.querySelectorAll('.contaniner span')
        span.forEach(item => {
             item.onclick = (e)=>{
                e.stopPropagation();
                span.forEach(i=>{
                    i.classList.remove('active')
                })
                item.classList.add('active')
             }
        });
        
        let activeDiv = document.querySelectorAll('.hearder-five-nav div')
        activeDiv.forEach(item =>{
            item.onclick = e =>{
                e.stopPropagation();
                activeDiv.forEach( i =>{
                     i.classList.remove('hearder-nav-active')
                })
                item.classList.add('hearder-nav-active')
            }
        })
        arrow.onclick = function () {
            if (flag) {

                flag = false
                arrow.classList.add('rotate')
                Height.classList.add('header-two-height-section')
                hearderNav.classList.add('hearder-five-nav')
                hearderNav.style.display = 'none'
                contaniner.style.display = 'block'
                
            } else {
                arrow.classList.remove('rotate')
                Height.classList.remove('header-two-height-section')
                
                hearderNav.style.display = 'block'
                contaniner.style.display = 'none'
                // 将display:none覆盖掉
                hearderNav.style.display = 'flex'   
                flag = true
            }
        }
        
    </script>

3.css

* {
    padding   : 0;
    margin    : 0;
    box-sizing: border-box;
}

ul li,
ol li {
    list-style-type: none;
}

.header-ad {
    width   : 100vw;
    height  : 9vh;
    position: relative;
}

.header-ad img {
    width : 100vw;
    height: 9vh;
}

.header-two-section {
    position  : relative;
    width     : 100vw;
    height    : 13vh;
    padding   : 0 2vw;
    background: #f2f2f2;

}
.header-two-height-section {
    position  : relative;
    width     : 100vw;
    height    : 28vh;
    padding   : 0 2vw;
    background: #f2f2f2;
    transition: all .5s;
}


.logo {
    width          : 100%;
    height         : 7vh;
    display        : flex;
    justify-content: center;
    align-items    : center;
    text-align     : center;
}

.logo-img {
    width : 15%;
    height: 1.625rem;
}

.logo-img img {
    width : 1.625rem;
    height: 1.625rem;
}

.search {
    width           : 70%;
    height          : 2rem;
    display         : flex;
    border          : .0625rem solid #ccc;
    align-items     : center;
    background-color: white;
    border-radius   : .1875rem;
    text-align      : center;
}

.search-img,
.search-img img {
    width : 1.25rem;
    height: 1.25rem;
}

.search-input {
    color    : #ccc;
    font-size: .9375rem;
}

.user-img {
    width : 15%;
    height: 1.625rem;
}

.user-img img {
    width : 1.25rem;
    height: 1.25rem;
}

.hearder-nav {
    position: relative;
    width          : 100%;
    /* height         : 10vh; */
    display        : flex;
    justify-content: space-between;
    align-items    : center;
   
}

.hearder-five-nav {
    display        : flex;
    justify-content: space-between;
    width          : 80%;
    color: #ccc;
    
}


/* 导航箭头 */
.hearder-nav-img {
    /* 导航箭头定位 */
    position: absolute;
    width : 21px;
    height: 21px;
    right: 13px;
    top: 3px;
}

.hearder-nav-img div {
    background     : url(./images/xiajiantou.png) no-repeat;
    width          : 21px;
    height         : 21px;
    background-size: 21px 21px;
    /* 过渡 */
    /* transform   : rotate(0); */
    transition     : transform .2s linear;
}

.rotate {
    transform : rotate(180deg);
    transition: transform .2s linear;
}
.contaniner{
    width: 100%;
    color: gray;
    
}
.contaniner-text{
    padding-top: 8px;
}
.contaniner span{
   display: inline-block;
   width: 75px;
   height: 30px;
   border: 1px solid #ccc;
   border-radius: 3px;
   text-align: center;
   line-height: 30px;
   margin: 10px 10px 0px 0;
}
.nav-display{
    display: block;
}
.no-display{
    display: none;
}
.active{
    background-color: pink;
    color: white;
    transform: scale(1.1);
    transition: transform .5s linear;
    
}
.hearder-nav-active{
    color: orange;
    padding-bottom: 10px;
    border-bottom: 3px solid orange;
}
.header-three-section {
    width: 100%;
}
.three-section-img {
    display: flex;
}

.three-section-img img {
    width : 4.6875rem;
    height: 4.9375rem;
}

.line {
    width           : 100%;
    height          : .5rem;
    background-color: #f2f2f2;
}

.main-section {
    width          : 100%;
    /* height      : 20vh; */
    display        : flex;
    justify-content: space-around;
}

.main-section-img {
    width    : 50vw;
    /* height:16.875rem;  */
    height   : 16.625rem;
}

.main-section-img img {
    width    : 50vw;
    /* height:16.875rem;  */
    height   : 16.625rem;
}

.main-section-two-img {
    width          : 49vw;
    height         : 16.625rem;
    display        : flex;
    flex-direction : column;
    justify-content: space-between;
}

.main-section-two-img img {
    width : 11.625rem;
    height: 8.1875rem;
}

.box {
    display        : flex;
    justify-content: space-between;
}

.main-image {
    width             : 100%;
    padding           : 0 1vw;
    height            : 18.75rem;
    display           : flex;
    /* justify-content: center;
    align-items       : center; */
    flex-direction    : column;
    text-align        : center;
}

.main-image img {
    width : 11.25rem;
    height: 9.125rem;
}

.red {
    color: red;
}

.btn {
    padding         : .3125rem .625rem;
    background-color: red;
    color           : white;
    border-radius   : .3125rem;
}

footer {
    position        : fixed;
    left            : 0;
    bottom          : 0;
    width           : 100%;
    height          : 3.125rem;
    background-color: white;
    display         : flex;
}

.footer-section {
    width         : 25%;
    display       : flex;
    text-align    : center;
    flex-direction: column;
}

.footer-section img {
    width : 1.3125rem;
    height: 1.3125rem;


}