<div id="div"> <div class="div1">1</div> <div class="div2">2</div> <div class="div3">3</div> </div>
父元素
#div{ width: 400px; height: 400px; background-color: yellow; display: -webkit-flex; /* Safari */ display: flex; //关键步骤 justify-content: space-between;//关键步骤 width:100%;
flex-wrap: wrap;
}
子元素 #div div{ width:33.333%; height: 100px; }