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"name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1,minimum-scale=1"title>grid</link rel="stylesheet" href="font/iconfont.css"="base.css"="grid-flex.css"="index.css"bodyheader class="header-container">
        div ="container">
            ="row">
                ="header-logo-container col-8 col-md-3">
                    a href="#" class="header-logo"><img src="img/logo.svg"></adiv="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"="btn-toggle" id="btn-toggle">
                        span ="btn-toggle-bar"spanbutton="header-nav-container col-md-9 d-none d-md-block"ul ="header-nav"li ="header-nav-item"="header-nav-link">手机&amp;平板li>电视&amp;影音>生活家电>电脑/办公/储存>网上商城ulheader>

    nav ="nav-container d-md-none"="nav"="nav-link"nav="slider-container"="slider-text-container col-md-5 col-md-order-last"h3 ="slider-title">Galaxy S9 | S9+h3h4 ="slider-subtitle">冰蓝 焕新上市h4="slider-btns"="btn-rounded">了解更多>立即购买="col-md-7 col-md-order-first"="img/1.png"script>
        var nav=document.getElementById("nav);
         navExtendedClassNamenav-container-extended;

        document.getElementById(btn-toggle).onclickfunction(){
            if(nav.classList.contains(navExtendedClassName)){
                nav.classList.remove(navExtendedClassName);
            }else{
                nav.classList.add(navExtendedClassName);
            }
        }
    html>

base.css

*{margin:0;padding: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;14px;color:#363636;}
a:hover{#1428a0;}

grid-flex.css

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



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

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

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


    .col-sm{flex-basis:
    .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-sm-offset-0{
    .col-sm-offset-1{
    .col-sm-offset-2{
    .col-sm-offset-3{
    .col-sm-offset-4{
    .col-sm-offset-5{
    .col-sm-offset-6{
    .col-sm-offset-7{
    .col-sm-offset-8{
    .col-sm-offset-9{
    .col-sm-offset-10{
    .col-sm-offset-11{
    .col-sm-offset-12{

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

    .col-md-order-first{
    .col-md-order-0{
    .col-md-order-1{
    .col-md-order-2{
    .col-md-order-3{
    .col-md-order-4{
    .col-md-order-5{
    .col-md-order-6{
    .col-md-order-7{
    .col-md-order-8{
    .col-md-order-9{
    .col-md-order-10{
    .col-md-order-11{
    .col-md-order-12{
    .col-md-order-last{
    .col-lg{flex-basis:
    .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-lg-offset-0{
    .col-lg-offset-1{
    .col-lg-offset-2{
    .col-lg-offset-3{
    .col-lg-offset-4{
    .col-lg-offset-5{
    .col-lg-offset-6{
    .col-lg-offset-7{
    .col-lg-offset-8{
    .col-lg-offset-9{
    .col-lg-offset-10{
    .col-lg-offset-11{
    .col-lg-offset-12{

    .col-lg-order-first{
    .col-lg-order-0{
    .col-lg-order-1{
    .col-lg-order-2{
    .col-lg-order-3{
    .col-lg-order-4{
    .col-lg-order-5{
    .col-lg-order-6{
    .col-lg-order-7{
    .col-lg-order-8{
    .col-lg-order-9{
    .col-lg-order-10{
    .col-lg-order-11{
    .col-lg-order-12{
    .col-lg-order-last{
    .col-xl{flex-basis:
    .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{

    .col-xl-offset-0{
    .col-xl-offset-1{
    .col-xl-offset-2{
    .col-xl-offset-3{
    .col-xl-offset-4{
    .col-xl-offset-5{
    .col-xl-offset-6{
    .col-xl-offset-7{
    .col-xl-offset-8{
    .col-xl-offset-9{
    .col-xl-offset-10{
    .col-xl-offset-11{
    .col-xl-offset-12{

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


.d-none{ none !important;}
.d-block{ block !important;}

    .d-sm-none{display:
    .d-sm-block{ block !important;}
    .d-md-none{display:
    .d-md-block{
    .d-lg-none{display:
    .d-lg-block{
    .d-xl-none{display:
    .d-xl-block{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-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;-moz-flex;-ms-flex;-o-flex;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-container{
        overflow:hidden;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{201px;40*5+10;
    }
    slider
    .slider-container{
        margin:20px 0;
    }
    .slider-container .row{#f5f5f5;0;
    }
    @media (min-width:768px){
        .slider-container .row{
            display: flex;
            align-items:center;
        }
    }
    .slider-text-container{
        padding:20px;
    }


组件btn-toggle
    .btn-toggle{10px;transparent;
        border:none;
        border-radius:4px;
        cursor:pointer;
    }
    .btn-toggle:hover{#f9f9f9;
    }
    .btn-toggle-bar{ block;
        width:24px;#363636;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{#1428a0;
    }
    btn-rounded
    .btn-rounded{inline-block;10px 30px;1px solid #000;
        color:#000;30px;
        font-size:16px;
        font-weight:bold;all .3s;
    }
    .btn-rounded:hover{#000;
    }

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

效果图

用flex布局实现栅格系统

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