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纯CSS3怎么创建瀑布流布局？columns方法浅析

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本篇教程我们来聊聊使用CSS3 column系列属性怎么实现瀑布流布局，感兴趣的朋友可以去了解一下~

我们提到CSS响应布局的，就会想要使用Grid和Flexbox来实现，其实它们也有一些局限性。像瀑布流布局这种，就无法用它们来简单实现。

这其中的原因就是瀑布流一般来说都是宽度一致，但是高度是根据图片自适应的。并且图片的位置也是根据在上方图片的位置而定的。

那么如何使用纯CSS3实现瀑布流布局呢？我们可以利用CSS3 column系列属性！


下面我们就先直接上代码：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <style>
            body,
            html {
                position: relative;
                width: 100%;
                height: 100%;
                background: #4f000b;
                font-family: "PT Mono", monospace;
            }
 
            .masonry {
                -moz-column-count: 1; 
                column-count: 1;   /* 设置列数 */
                -moz-column-gap: 0;
                column-gap: 0;  /* 设置列间距 */
                counter-reset: item-counter;
            }
             
            /* 根据不同的屏幕宽度 设置不同的列数*/
            @media screen and (min-width: 400px) {
                .masonry {
                    -moz-column-count: 2;  
                    column-count: 2;
                }
            }
 
            @media screen and (min-width: 600px) {
                .masonry {
                    -moz-column-count: 3;
                    column-count: 3;
                }
            }
 
            @media screen and (min-width: 800px) {
                .masonry {
                    -moz-column-count: 4;
                    column-count: 4;
                }
            }
 
            @media screen and (min-width: 1100px) {
                .masonry {
                    -moz-column-count: 5;
                    column-count: 5;
                }
            }
 
            .item {
                box-sizing: border-box;
                -moz-column-break-inside: avoid;
                break-inside: avoid;
                padding: 10px;
                counter-increment: item-counter;
            }
 
            .item__content {
                position: relative;
                display: flex;
                flex-direction: column;
                justify-content: center;
                align-items: center;
                height: 220px;
                font-size: 40px;
                color: #360007;
                background: currentColor;
                box-sizing: border-box;
                color: #720026;
            }
 
            .item__content:hover {
                background: #9b0034;
            }
 
            .item__content:before {
                position: absolute;
                top: 0;
                left: 0;
                font-size: 13px;
                width: 2em;
                height: 2em;
                line-height: 2em;
                text-align: center;
                font-weight: bold;
                background-color: #222;
                content: counter(item-counter);
            }
 
            .item__content--small {
                color: #ce4257;
                height: 100px;
            }
 
            .item__content--small:hover {
                background: #d66274;
            }
 
            .item__content--medium {
                color: #ffc093;
                height: 175px;
            }
 
            .item__content--medium:hover {
                background: #ffd8bc;
            }
 
 
            .item__content--large {
                color: #ff7f51;
                height: 280px;
            }
 
            .item__content--large:hover {
                background: #ff9d7a;
            }
        </style>
    </head>
 
    <body>
        <div class="masonry">
            <div class="item">
                <div class="item__content">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--small">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--medium">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--small">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--medium">
                </div>
            </div>
            <div class="item">
                <div class="item__content">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--large">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--medium">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--small">
                </div>
            </div>
            <div class="item">
                <div class="item__content">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--large">
                </div>
            </div>
            <div class="item">
                <div class="item__content">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--small">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--large">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--medium">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--small">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--medium">
                </div>
            </div>
            <div class="item">
                <div class="item__content">
                </div>
            </div>
            <div class="item">
                <div class="item__content item__content--small">
                </div>
            </div>
        </div>
    </body>
</html>


效果如下图所示：


6124950224af9.jpg


ok，瀑布流布局实现了！那么下面分析一下上述代码，给大家介绍几个关键的css属性：

@media 查询：可以针对不同的屏幕尺寸设置不同的样式

@media mediatype and|not|only (media feature) {
    CSS-Code;
}

column-count属性：指定某个元素应分为的列数。

column-gap 属性：指定列间距。

column-gap: length|normal;
length    一个指定的长度，将设置列之间的差距    
normal    指定一个列之间的普通差距。 W3C建议1EM值

break-inside属性：描述了在多列布局页面下的内容盒子如何中断，如果多列布局没有内容盒子，这个属性会被忽略。

上例中：

.item { break-inside: avoid; box-sizing: border-box; padding: 10px; }

break-inside:avoid为了控制文本块分解成单独的列，以免项目列表的内容跨列，破坏整体的布局。

counter-increment属性：递增一个或多个计数器值，通常用于counter-reset属性和content属性。例如上例中：

.item {
    counter-increment: item-counter;
}
 
.item__content:before {
    content: counter(item-counter);
}


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