效果如下:
如何利用css3的flex让div里面的多个相同大小元素，两边对齐，等距离铺开_html
代码如下:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style type="text/css">
            #box{
                display: flex;
                display: -webkit-flex;
                flex-direction: row;
                justify-content:space-between;

                border: 1px solid #0000FF;
                height: 200px;
                width: 400px;                
            }
            .item{
                width: 50px;
                height: 40px;
                border: 1px solid #00C1B3;
                text-align:center;
                line-height: 40px;
            }
        </style>
    </head>
    <body>
        <div id="box">
            <div class="item">1</div>
            <div class="item">2</div>
            <div class="item">3</div>
            <div class="item">4</div>
            <div class="item">5</div>
        </div>
    </body>
</html>