当用户缩小浏览器窗口时，如何使2个或多个水平div堆叠为垂直div? [英] How do I make 2 or more horizontal divs stack into a vertical div when the user shrinks the browser window?

问题描述

我在同一行上有2个div，每个div的宽度为50％，左侧为浮点数.如果用户正在通过智能手机查看页面，我希望它们可以堆叠在一起.现在，即使浏览器窗口缩小到300px或从智能手机查看，div仍保持在同一行.

I have 2 divs on same row, each with a width of 50% and a float: left. I would like them to stack one on top of the other if the user is viewing the page from a smart-phone. Right now, the divs remain on the same row even if the browser window is narrowed to 300px or if viewed from a smart-phone.

推荐答案

媒体查询是解决之道.我将采用移动优先的方法，并添加媒体查询以扩大设计范围.即，以divs not 浮动开始，并在屏幕尺寸达到一定大小时添加浮动和宽度:

Media queries is the way to go. I'd go with a mobile-first approach, and add media queries to scale up the design. I.e, start with the divs not floating, and add float and width when the screen estate reaches a certain size:

<!-- HTML -->
<div class="wrapper">
    <div class="column">
        <p>This is column 1</p>
    </div>
    <div class="column">
        <p>This is column 2</p>
    </div>
</div>

---

/* CSS */
.wrapper {
    /* Ensure wrapper contains the columns, even when they are floated, by
       creating a new Block formatting context */
    overflow: hidden;
}

.column {
    /* Ensure we have some margins when the columns are collapsed, or 
       other content is displayed below. */
    margin-bottom: 2em;
}

/* Edit the min-width condition to match your desired breakpoint. */
@media screen and (min-width: 400px) {
    .wrapper .column {
        width: 50%;
        float: left;
    }
}

此处的实时演示: http://jsfiddle.net/jPgWL/

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