<header class="header">
<div class="fw">
	<a class="logo" href="index.html"><img src="images/logo.png?" alt=""><span>Coin-Fast</span></a>
	<div class="navbox">
		<div class="nav">    
			<a class="item active" href="index.html">HOME</a>
			<a class="item " href="about.html">COMPANY PROFILE</a>
			<a class="item " href="product.html">PRODUCT</a>
			<a class="item " href="contact.html">CONTACT US</a>
		</div>
	</div>

	<div class="navbtn">
		<div class="line line1"></div>
		<div class="line line2"></div>
		<div class="line line3"></div>
	</div>
</div>
</header>



css  navbar 样式

@media screen and (max-width: 1240px) {
    .nav .item {
        margin: 0 18px;
        font-size: 14px;
    }

    .language .item {
        font-size: 14px;
    }

    .subbanner .fw {
        padding-left: 20px;
    }

    .product-list li .icon {
        width: 120px;
    }

    .product-list li .cons {
        margin-left: 30px;
    }

    .product-list li .name {
        font-size: 24px;
        padding-bottom: 15px;
    }

    .product-list li .name::after {
        height: 6px;
        width: 130px;
    }

    .product-list li .state {
        margin: 20px 0;
    }

    .product .left {
        width: 280px;
    }

    .product .rightcon {
        margin-left: 50px;
    }

    .product-detail .con {
        margin-left: 50px;
    }

    .product-detail .title {
        font-size: 32px;
        padding-bottom: 20px;
    }

    .product-detail .tt {
        font-size: 16px;
    }

    .product-detail .brief {
        margin-top: 30px;
    }

    .contact-us .right .tt3 {
        font-size: 24px;
    }

    .contact-us .right .tt2 {
        font-size: 18px;
    }

    .contact-us .right {
        padding: 40px;
    }

    .contact-us .left .tt1 {
        margin-bottom: 50px;
        font-size: 36px;
    }

    .contact-us .left {
        padding: 65px 30px 100px 40px;
    }

    .probox .brief {
        font-size: 16px;
        margin: 40px 0;
    }

    .probox .name {
        font-size: 36px;
    }

    .probox .icon {
        width: 40%;
    }

    .probox1 .icon {
        text-align: left;
    }

    .probox2 .icon {
        text-align: right;
    }

    .probox .name::before {
        width: 170px;
        height: 15px;
    }

    .abox1 .wrap .brief {
        font-size: 16px;
        padding-left: 30px;
    }

    .abox1 .title {
        font-size: 32px;
        margin-bottom: 30px;
    }

    .abox1 .wrap .pic {
        padding-top: 8px;
    }

    .abox1 .wrap {
        margin-bottom: 60px;
    }

    .abox1 .list li .ww {
        padding: 20px;
    }

    .common-title p {
        font-size: 36px;
    }

    .abox2 .state {
        font-size: 16px;
        line-height: 1.7;
        margin: 30px 0;
    }

    .morelist li .ww {
        width: 100%;
    }

    .morelist li {
        width: 33.3%;
        padding: 0 20px;
    }

    .morelist {
        margin: 80px -20px 0;
    }

    .video-list li {
        padding: 0 12px;
        margin-bottom: 24px;
    }

    .video-list {
        margin: 0 -12px;
    }
}

@media screen and (max-width: 1080px) {
    .nav .item {
        margin: 0 14px;
    }

    .brandlist {
        margin: 0 -20px;
    }

    .brandlist li {
        margin-bottom: 30px;
        padding: 0 20px;
    }

    .subbanner .title {
        font-size: 32px;
        margin-bottom: 15px;
    }

    .subbanner .state {
        font-size: 16px;
    }

    .subbanner {
        padding: 80px 0;
    }

    .product .fw {
        display: block;
    }

    .product .left {
        width: 100%;
        margin-bottom: 20px;
    }

    .product .rightcon {
        margin-left: 0;
    }

    .product .left .brief {
        padding-bottom: 15px;
        margin-bottom: 20px;
        margin-top: 20px;
    }

    .sort {
        display: flex;
        flex-wrap: wrap;
    }

    .sort a {
        margin-bottom: 10px;
        margin-right: 15px;
    }

    .morelist li .tt {
        font-size: 16px;
        margin-bottom: 50px;
    }

    .video-list li .tt {
        font-size: 16px;
    }

    .video-list li .state {
        font-size: 14px;
    }
}

@media screen and (max-width: 968px) {
    .navbox {
        position: fixed;
        width: 240px;
        background-color: #fff;
        top: 0;
        box-shadow: -5px 0px 5px 0px rgba(0, 0, 0, .1);
        bottom: 0;
        display: block;
        padding-top: 60px;
        right: -300px;
        transition: all .8s ease;
        background-image: url(../images/bg_main.png);
        background-repeat: repeat;
        height: 100%;
    }

    .navbtn {
        display: block;
    }

    .language .item {
        justify-content: center;
        font-weight: normal;
    }

    .header .fw {
        padding-right: 70px;
    }

    .nav .item {
        display: block;
        text-align: center;
        margin: 0 0 10px;
        line-height: 2;
        font-weight: normal;
    }

    .brandlist li {
        width: 33.3%;
    }

    .footer .itemlist .tt {
        font-size: 18px;
        margin-bottom: 16px;
    }

    .footer .itemlist .links a {
        font-size: 14px;
    }

    .footer .itemlist .links a+a {
        margin-top: 12px;
    }

    .footer .iconlist li+li {
        margin-top: 18px;
    }

    .aboutus .pic .icon1,
    .aboutus .pic .icon2,
    .aboutus .pic .icon3,
    .aboutus .pic .icon4 {
        display: none;
    }

    .aboutus .pic {
        padding: 0;
    }

    .aboutus .brief {
        margin-bottom: 30px;
        font-size: 16px;
    }

    .aboutus .title {
        font-size: 36px;
        margin-bottom: 20px;
    }

    .product-detail .fw {
        display: block;
    }

    .product-detail .pic {
        width: 100%;
        max-width: 100%;
        text-align: center;
        margin-bottom: 30px;
    }

    .product-detail .con {
        margin-left: 0;
    }

    .product-detail .pic img {
        width: 350px;
        max-width: 80%;
    }

    .contact-us .fw {
        display: block;
    }

    .contact-us .left {
        width: 100%;
        padding: 40px 30px;
    }

    .contact-us .right {
        width: 100%;
    }

    .contact-us .left .infos {
        font-size: 16px;
    }

    .contact-us .left .infos p+p {
        margin-top: 12px;
    }

    .contact-us .left .tt1 {
        margin-bottom: 30px;
    }

    .probox .fw {
        display: block;
    }

    .probox1 .icon {
        text-align: center;
        width: 100%;
    }

    .probox2 .icon {
        text-align: center;
        width: 100%;
    }

    .probox .icon img {
        width: 200px;
        max-width: 40%;
    }

    .probox .name {
        font-size: 32px;
    }

    .probox .brief {
        font-size: 14px;
        margin: 20px 0;
    }

    .pricacy .fw {
        display: block;
    }

    .pricacy .left {
        display: flex;
        flex-wrap: wrap;
        width: 100%;
    }

    .pricacy .left a {
        padding-left: 12px;
    }

    .pricacy .right {
        margin-left: 0;
        margin-top: 20px;
    }

    .pricacy .title {
        font-size: 20px;
        padding: 15px;
    }

    .pricacy .inbox {
        padding: 20px 15px;
    }

    .pricacy .inbox .t0 {
        font-size: 20px;
    }

    .pricacy .inbox {
        line-height: 1.5;
    }

    .abox1 .wrap {
        display: block;
        margin-bottom: 50px;
    }

    .abox1 .wrap .pic {
        width: 100%;
        padding-top: 0;
        margin-bottom: 20px;
    }

    .abox1 .wrap .brief {
        padding-left: 0;
        width: 100%;
        font-size: 15px;
        line-height: 1.6;
    }

    .abox1 .list li {
        width: 50%;
        padding: 0 12px;
    }

    .abox1 .list {
        margin: 0 -12px;
    }

    .aboutwrap .abox1 {
        padding-top: 60px;
    }

    .abox2 .fw {
        display: block;
    }

    .abox2 .left {
        width: 100%;
        margin-bottom: 30px;
    }

    .abox2 .right {
        width: 100%;
        text-align: center;
    }

    .morelist li {
        padding: 0 10px;
        margin-bottom: 20px;
    }

    .morelist {
        margin: 60px -10px 0;
    }

    .common-title p {
        font-size: 30px;
    }

    .morelist li .ww {
        padding: 40px 10px 20px 20px;
    }

    .morelist li .icon {
        left: 20px;
    }
}

js代码

$(function() {
    // 导航展开收回
    $('.navbtn').click(function() {
        $('body').toggleClass('open')
    })

    // 下拉语言
    $('.language .item').mouseenter(function() {
        if ($(this).hasClass('on')) {
            $(this).removeClass('on');
            $(this).next().slideUp()
        } else {
            $(this).addClass('on');
            $(this).next().slideDown()
        }
    })
    $('.language').mouseleave(function() {
        $('.language .item').removeClass('on');
        $('.language .list').slideUp()
    })


})