用flex布局实现栅格系统

之前一篇栅格系统是用float布局来实现的 https://www.cnblogs.com/chenyingying0/p/12495051.html

其实并不太适合移动端，不过优点是兼容性比较好

这篇用flex来进行布局，不管在PC端还是移动端都很适合

不过存在兼容性问题，在低版本浏览器不适用。但纯粹移动端的话，效果很不错

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1">
    <title>grid</title>
    <link rel="stylesheet" href="font/iconfont.css">
    <link rel="stylesheet" href="base.css">
    <link rel="stylesheet" href="grid-flex.css">
    <link rel="stylesheet" href="index.css">
</head>
<body>
    <header class="header-container">
        <div class="container">
            <div class="row">
                <div class="header-logo-container col-8 col-md-3">
                    <a href="#" class="header-logo"><img src="img/logo.svg"></a>
                </div>
                <div class="header-btn-container col-4 d-md-none">
                    <!-- button一定要加type，否则不同浏览器给的值不同 -->
                    <button type="button" class="btn-toggle" id="btn-toggle">
                        <span class="btn-toggle-bar"></span>
                        <span class="btn-toggle-bar"></span>
                        <span class="btn-toggle-bar"></span>
                    </button>
                </div>
                <div class="header-nav-container col-md-9 d-none d-md-block">
                    <ul class="header-nav">
                        <li class="header-nav-item"><a href="#" class="header-nav-link">手机&平板</a></li>
                        <li class="header-nav-item"><a href="#" class="header-nav-link">电视&影音</a></li>
                        <li class="header-nav-item"><a href="#" class="header-nav-link">生活家电</a></li>
                        <li class="header-nav-item"><a href="#" class="header-nav-link">电脑/办公/储存</a></li>
                        <li class="header-nav-item"><a href="#" class="header-nav-link">网上商城</a></li>
                    </ul>
                </div>
            </div>
        </div>
    </header>

    <nav class="nav-container d-md-none" id="nav">
        <ul class="container">
            <li><a href="#" class="nav-link">手机&平板</a></li>
            <li><a href="#" class="nav-link">电视&影音</a></li></a></li>
            <li><a href="#" class="nav-link">生活家电</a></li>
            <li><a href="#" class="nav-link">电脑/办公/储存</a></li>
            <li><a href="#" class="nav-link">网上商城</a></li>
        </ul>
    </nav>

    <div class="slider-container">
        <div class="container">
            <div class="row">
                <div class="slider-text-container col-md-5 col-md-order-last">
                    <h3 class="slider-title">Galaxy S9 | S9+</h3>
                    <h4 class="slider-subtitle">冰蓝 焕新上市</h4>
                    <div class="slider-btns">
                        <a href="#" class="btn-rounded">了解更多</a>
                        <a href="#" class="btn-rounded">立即购买</a>
                    </div>
                </div>
                <div class="col-md-7 col-md-order-first">
                    <img src="img/1.png">
                </div>
            </div>
        </div>
    </div>

    <script>
        var nav=document.getElementById("nav");
        var navExtendedClassName="nav-container-extended";

        document.getElementById("btn-toggle").onclick=function(){
            if(nav.classList.contains(navExtendedClassName)){
                nav.classList.remove(navExtendedClassName);
            }else{
                nav.classList.add(navExtendedClassName);
            }
        }
    </script>
</body>
</html>

base.css

*{margin:0;padding:0;box-sizing:border-box;}
body{font-size:14px;}
ul{list-style: none;}
img{width:100%;border:none;/*IE浏览器会加边框*/vertical-align: top;/*解决图片与边框之间的间距*/}
a{text-decoration: none;font-size:14px;color:#363636;}
a:hover{color:#1428a0;}

grid-flex.css

/*解决嵌套时的padding:0 15px*/
.row{margin:0 -15px;display:flex;flex-wrap:wrap;}
/*xs*/
.container{width:100%;margin:0 auto;/*水平居中*/padding:0 15px;/*解决不嵌套时的margin:0 -15px;*/}
/*sm*/
@media (min-width:576px){
    .container{width:540px;}
}
/*md*/
@media (min-width:768px){
    .container{width:720px;}
}
/*lg*/
@media (min-width:992px){
    .container{width:960px;}
}
/*xl*/
@media (min-width:1200px){
    .container{width:1140px;}
}


/*xs*/
.col{flex-basis:0;flex-grow:1;}/*平分空间的布局*/
.col-1{flex:0 0 8.3333%;}
.col-2{flex:0 0 16.6667%;}
.col-3{flex:0 0 25%;}
.col-4{flex:0 0 33.3333%;}
.col-5{flex:0 0 41.6667%;}
.col-6{flex:0 0 50%;}
.col-7{flex:0 0 58.3333%;}
.col-8{flex:0 0 66.6667%;}
.col-9{flex:0 0 75%;}
.col-10{flex:0 0 83.3333%;}
.col-11{flex:0 0 91.6667%;}
.col-12{flex:0 0 100%;}

.col-offset-0{margin-left:0;}
.col-offset-1{margin-left:8.3333%;}
.col-offset-2{margin-left:16.6667%;}
.col-offset-3{margin-left:25%;}
.col-offset-4{margin-left:33.3333%;}
.col-offset-5{margin-left:41.6667%;}
.col-offset-6{margin-left:50%;}
.col-offset-7{margin-left:58.3333%;}
.col-offset-8{margin-left:66.6667%;}
.col-offset-9{margin-left:75%;}
.col-offset-10{margin-left:83.3333%;}
.col-offset-11{margin-left:91.6667%;}
.col-offset-12{margin-left:100%;}

.col-order-first{order:-1;}
.col-order-0{order:0;}
.col-order-1{order:1;}
.col-order-2{order:2;}
.col-order-3{order:3;}
.col-order-4{order:4;}
.col-order-5{order:5;}
.col-order-6{order:6;}
.col-order-7{order:7;}
.col-order-8{order:8;}
.col-order-9{order:9;}
.col-order-10{order:10;}
.col-order-11{order:11;}
.col-order-12{order:12;}
.col-order-last{order:13;}

/*sm*/
@media (min-width:576px){
    .col-sm{flex-basis:0;flex-grow:1;}/*平分空间的布局*/
    .col-sm-1{flex:0 0 8.3333%;}
    .col-sm-2{flex:0 0 16.6667%;}
    .col-sm-3{flex:0 0 25%;}
    .col-sm-4{flex:0 0 33.3333%;}
    .col-sm-5{flex:0 0 41.6667%;}
    .col-sm-6{flex:0 0 50%;}
    .col-sm-7{flex:0 0 58.3333%;}
    .col-sm-8{flex:0 0 66.6667%;}
    .col-sm-9{flex:0 0 75%;}
    .col-sm-10{flex:0 0 83.3333%;}
    .col-sm-11{flex:0 0 91.6667%;}
    .col-sm-12{flex:0 0 100%;}

    .col-sm-offset-0{margin-left:0;}
    .col-sm-offset-1{margin-left:8.3333%;}
    .col-sm-offset-2{margin-left:16.6667%;}
    .col-sm-offset-3{margin-left:25%;}
    .col-sm-offset-4{margin-left:33.3333%;}
    .col-sm-offset-5{margin-left:41.6667%;}
    .col-sm-offset-6{margin-left:50%;}
    .col-sm-offset-7{margin-left:58.3333%;}
    .col-sm-offset-8{margin-left:66.6667%;}
    .col-sm-offset-9{margin-left:75%;}
    .col-sm-offset-10{margin-left:83.3333%;}
    .col-sm-offset-11{margin-left:91.6667%;}
    .col-sm-offset-12{margin-left:100%;}

    .col-sm-order-first{order:-1;}
    .col-sm-order-0{order:0;}
    .col-sm-order-1{order:1;}
    .col-sm-order-2{order:2;}
    .col-sm-order-3{order:3;}
    .col-sm-order-4{order:4;}
    .col-sm-order-5{order:5;}
    .col-sm-order-6{order:6;}
    .col-sm-order-7{order:7;}
    .col-sm-order-8{order:8;}
    .col-sm-order-9{order:9;}
    .col-sm-order-10{order:10;}
    .col-sm-order-11{order:11;}
    .col-sm-order-12{order:12;}
    .col-sm-order-last{order:13;}
}
/*md*/
@media (min-width:768px){
    .col-md{flex-basis:0;flex-grow:1;}/*平分空间的布局*/
    .col-md-1{flex:0 0 8.3333%;}
    .col-md-2{flex:0 0 16.6667%;}
    .col-md-3{flex:0 0 25%;}
    .col-md-4{flex:0 0 33.3333%;}
    .col-md-5{flex:0 0 41.6667%;}
    .col-md-6{flex:0 0 50%;}
    .col-md-7{flex:0 0 58.3333%;}
    .col-md-8{flex:0 0 66.6667%;}
    .col-md-9{flex:0 0 75%;}
    .col-md-10{flex:0 0 83.3333%;}
    .col-md-11{flex:0 0 91.6667%;}
    .col-md-12{flex:0 0 100%;}

    .col-md-offset-0{margin-left:0;}
    .col-md-offset-1{margin-left:8.3333%;}
    .col-md-offset-2{margin-left:16.6667%;}
    .col-md-offset-3{margin-left:25%;}
    .col-md-offset-4{margin-left:33.3333%;}
    .col-md-offset-5{margin-left:41.6667%;}
    .col-md-offset-6{margin-left:50%;}
    .col-md-offset-7{margin-left:58.3333%;}
    .col-md-offset-8{margin-left:66.6667%;}
    .col-md-offset-9{margin-left:75%;}
    .col-md-offset-10{margin-left:83.3333%;}
    .col-md-offset-11{margin-left:91.6667%;}
    .col-md-offset-12{margin-left:100%;}

    .col-md-order-first{order:-1;}
    .col-md-order-0{order:0;}
    .col-md-order-1{order:1;}
    .col-md-order-2{order:2;}
    .col-md-order-3{order:3;}
    .col-md-order-4{order:4;}
    .col-md-order-5{order:5;}
    .col-md-order-6{order:6;}
    .col-md-order-7{order:7;}
    .col-md-order-8{order:8;}
    .col-md-order-9{order:9;}
    .col-md-order-10{order:10;}
    .col-md-order-11{order:11;}
    .col-md-order-12{order:12;}
    .col-md-order-last{order:13;}
}
/*lg*/
@media (min-width:992px){
    .col-lg{flex-basis:0;flex-grow:1;}/*平分空间的布局*/
    .col-lg-1{flex:0 0 8.3333%;}
    .col-lg-2{flex:0 0 16.6667%;}
    .col-lg-3{flex:0 0 25%;}
    .col-lg-4{flex:0 0 33.3333%;}
    .col-lg-5{flex:0 0 41.6667%;}
    .col-lg-6{flex:0 0 50%;}
    .col-lg-7{flex:0 0 58.3333%;}
    .col-lg-8{flex:0 0 66.6667%;}
    .col-lg-9{flex:0 0 75%;}
    .col-lg-10{flex:0 0 83.3333%;}
    .col-lg-11{flex:0 0 91.6667%;}
    .col-lg-12{flex:0 0 100%;}

    .col-lg-offset-0{margin-left:0;}
    .col-lg-offset-1{margin-left:8.3333%;}
    .col-lg-offset-2{margin-left:16.6667%;}
    .col-lg-offset-3{margin-left:25%;}
    .col-lg-offset-4{margin-left:33.3333%;}
    .col-lg-offset-5{margin-left:41.6667%;}
    .col-lg-offset-6{margin-left:50%;}
    .col-lg-offset-7{margin-left:58.3333%;}
    .col-lg-offset-8{margin-left:66.6667%;}
    .col-lg-offset-9{margin-left:75%;}
    .col-lg-offset-10{margin-left:83.3333%;}
    .col-lg-offset-11{margin-left:91.6667%;}
    .col-lg-offset-12{margin-left:100%;}

    .col-lg-order-first{order:-1;}
    .col-lg-order-0{order:0;}
    .col-lg-order-1{order:1;}
    .col-lg-order-2{order:2;}
    .col-lg-order-3{order:3;}
    .col-lg-order-4{order:4;}
    .col-lg-order-5{order:5;}
    .col-lg-order-6{order:6;}
    .col-lg-order-7{order:7;}
    .col-lg-order-8{order:8;}
    .col-lg-order-9{order:9;}
    .col-lg-order-10{order:10;}
    .col-lg-order-11{order:11;}
    .col-lg-order-12{order:12;}
    .col-lg-order-last{order:13;}
}
/*xl*/
@media (min-width:1200px){
    .col-xl{flex-basis:0;flex-grow:1;}/*平分空间的布局*/
    .col-xl-1{flex:0 0 8.3333%;}
    .col-xl-2{flex:0 0 16.6667%;}
    .col-xl-3{flex:0 0 25%;}
    .col-xl-4{flex:0 0 33.3333%;}
    .col-xl-5{flex:0 0 41.6667%;}
    .col-xl-6{flex:0 0 50%;}
    .col-xl-7{flex:0 0 58.3333%;}
    .col-xl-8{flex:0 0 66.6667%;}
    .col-xl-9{flex:0 0 75%;}
    .col-xl-10{flex:0 0 83.3333%;}
    .col-xl-11{flex:0 0 91.6667%;}
    .col-xl-12{flex:0 0 100%;}

    .col-xl-offset-0{margin-left:0;}
    .col-xl-offset-1{margin-left:8.3333%;}
    .col-xl-offset-2{margin-left:16.6667%;}
    .col-xl-offset-3{margin-left:25%;}
    .col-xl-offset-4{margin-left:33.3333%;}
    .col-xl-offset-5{margin-left:41.6667%;}
    .col-xl-offset-6{margin-left:50%;}
    .col-xl-offset-7{margin-left:58.3333%;}
    .col-xl-offset-8{margin-left:66.6667%;}
    .col-xl-offset-9{margin-left:75%;}
    .col-xl-offset-10{margin-left:83.3333%;}
    .col-xl-offset-11{margin-left:91.6667%;}
    .col-xl-offset-12{margin-left:100%;}

    .col-xl-order-first{order:-1;}
    .col-xl-order-0{order:0;}
    .col-xl-order-1{order:1;}
    .col-xl-order-2{order:2;}
    .col-xl-order-3{order:3;}
    .col-xl-order-4{order:4;}
    .col-xl-order-5{order:5;}
    .col-xl-order-6{order:6;}
    .col-xl-order-7{order:7;}
    .col-xl-order-8{order:8;}
    .col-xl-order-9{order:9;}
    .col-xl-order-10{order:10;}
    .col-xl-order-11{order:11;}
    .col-xl-order-12{order:12;}
    .col-xl-order-last{order:13;}
}

/*xs*/
.d-none{display: none !important;}
.d-block{display: block !important;}
/*sm*/
@media (min-width:576px){
    .d-sm-none{display: none !important;}
    .d-sm-block{display: block !important;}
}
/*md*/
@media (min-width:768px){
    .d-md-none{display: none !important;}
    .d-md-block{display: block !important;}
}
/*lg*/
@media (min-width:992px){
    .d-lg-none{display: none !important;}
    .d-lg-block{display: block !important;}
}
/*xl*/
@media (min-width:1200px){
    .d-xl-none{display: none !important;}
    .d-xl-block{display: block !important;}
}

/*统一设置内边距*/
.col,.col-sm,.col-md,.col-lg,.col-xl,
.col-1,.col-2,.col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-10,.col-11,.col-12,
.col-sm-1,.col-sm-2,.col-sm-3,.col-sm-4,.col-sm-5,.col-sm-6,.col-sm-7,.col-sm-8,.col-sm-9,.col-sm-10,.col-sm-11,.col-sm-12,
.col-md-1,.col-md-2,.col-md-3,.col-md-4,.col-md-5,.col-md-6,.col-md-7,.col-md-8,.col-md-9,.col-md-10,.col-md-11,.col-md-12,
.col-lg-1,.col-lg-2,.col-lg-3,.col-lg-4,.col-lg-5,.col-lg-6,.col-lg-7,.col-lg-8,.col-lg-9,.col-lg-10,.col-lg-11,.col-lg-12,
.col-xl-1,.col-xl-2,.col-xl-3,.col-xl-4,.col-xl-5,.col-xl-6,.col-xl-7,.col-xl-8,.col-xl-9,.col-xl-10,.col-xl-11,.col-xl-12{
    padding:0 15px;
    width:100%;
}

index.css

/*布局*/
    /*header*/
    .header-container{
        background:#fff;
        border-bottom:1px solid #dadada;
    }
    .header-logo-container,
    .header-btn-container,
    .header-nav-container{
        height:64px;
    }
    .header-btn-container{
        display:-webkit-flex;
        display:-moz-flex;
        display:-ms-flex;
        display:-o-flex;
        display:flex;
        /*有浏览器兼容前缀，已省略。上线使用记得补全*/
        justify-content:flex-end;/*水平右对齐*/
        align-items:center/*;垂直居中*/
    }
    /*nav*/
    .nav-container{
        overflow:hidden;
        height:0;
        border-bottom:1px solid #dadada;
        transition:height .5s;/*需要补全兼容性写法*/
        position: relative;
        top:-1px;/*解决不展开时多出的1px底边*/
    }
    /*js中最好不要修改样式，而是通过控制类来改变*/
    .nav-container-extended{
        height:201px;/*40*5+1*/
        top:0;
    }
    /*slider*/
    .slider-container{
        margin:20px 0;
    }
    .slider-container .row{
        background:#f5f5f5;
        margin:0;
    }
    @media (min-width:768px){
        .slider-container .row{
            display: flex;
            align-items:center;
        }
    }
    .slider-text-container{
        padding:20px;
    }


/*组件*/
    /*btn-toggle*/
    .btn-toggle{
        padding:10px;
        background:transparent;
        border:none;
        border-radius:4px;
        cursor:pointer;
    }
    .btn-toggle:hover{
        background:#f9f9f9;
    }
    .btn-toggle-bar{
        display: block;
        width:24px;
        height:4px;
        background:#363636;
        border-radius:2px;
    }
    /*实现第一个条没有上间距*/
    .btn-toggle-bar+.btn-toggle-bar{
        margin-top:4px;
    }
    .btn-toggle:hover .btn-toggle-bar{
        background:#1428a0;
    }
    /*btn-rounded*/
    .btn-rounded{
        display:inline-block;
        padding:10px 30px;
        border:1px solid #000;
        color:#000;
        background:transparent;
        border-radius:30px;
        font-size:16px;
        font-weight:bold;
        transition:all .3s;
    }
    .btn-rounded:hover{
        color:#fff;
        background:#000;
    }

/*内容*/
    /*header*/
    .header-logo{
        width:136px;
        height:100%;
        display: flex;
        align-items:center;
    }
    .header-nav,
    .header-nav-item,
    .header-nav-link{
        height:100%;
    }
    .header-nav{
        display: flex;
        justify-content:flex-end;
        font-size:14px;
    }
    .header-nav-item{
        margin-left:24px;
    }
    .header-nav-item:first-child{
        margin-left:0;
    }
    .header-nav-link{
        display: flex;
        align-items:center;
        font-weight:bold;
    }
    /*nav*/
    .nav-link{
        display: block;
        height:40px;
        line-height:40px;
        font-weight:bold;
    }
    /*slider*/
    .slider-title,
    .slider-subtitle,
    .slider-btns{
        text-align:center;
        margin-bottom:20px;
    }
    .slider-title{
        font-size:30px;
    }
    .slider-subtitle{
        font-size:20px;
        font-weight:bold;
    }
    .slider-container .btn-rounded{
        margin-right:10px;
        margin-bottom:10px;
    }
    .slider-container .btn-rounded:last-child{
        margin-right:0;
    }

效果图

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