W3School TIY Editor

<!DOCTYPE html>
<html>
<style>
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial;
}

.header {
  text-align: center;
  padding: 32px;
}

.row {
  display: -ms-flexbox; /* IE10 */
  display: flex;
  -ms-flex-wrap: wrap; /* IE10 */
  flex-wrap: wrap;
  padding: 0 4px;
}

/* 创建四个并排的相等列 */
.column {
  -ms-flex: 25%; /* IE10 */
  flex: 25%;
  max-width: 25%;
  padding: 0 4px;
}

.column img {
  margin-top: 8px;
  vertical-align: middle;
  width: 100%;
}

/* 响应式布局 - 当屏幕宽度小于800px时，创建两列布局 */
@media screen and (max-width: 800px) {
  .column {
    -ms-flex: 50%;
    flex: 50%;
    max-width: 50%;
  }
}

/* 响应式布局 - 当屏幕宽度小于 600px 时，列垂直堆叠 */
@media screen and (max-width: 600px) {
  .column {
    -ms-flex: 100%;
    flex: 100%;
    max-width: 100%;
  }
}
</style>
<body>

<div class="header">
  <h1>自适应图片网格</h1>
  <p>调整浏览器窗口大小可查看自适应效果。</p>
</div>

<div class="row"> 
  <div class="column">
    <img src="/i/photo/shanghai.jpg" style="width:100%">
    <img src="/i/photo/wuhan.jpg" style="width:100%">
    <img src="/i/photo/beijing.jpg" style="width:100%">
    <img src="/i/photo/shenzhen.jpg" style="width:100%">
    <img src="/i/photo/shenzhen-1.jpg" style="width:100%">
    <img src="/i/photo/wuhan-1.jpg" style="width:100%">
    <img src="/i/photo/shenzhen.jpg" style="width:100%">
  </div>
  <div class="column">
    <img src="/i/photo/shanghai-1.jpg" style="width:100%">
    <img src="/i/photo/hangzhou-1.jpg" style="width:100%">
    <img src="/i/photo/shanghai.jpg" style="width:100%">
    <img src="/i/photo/shanghai-2.jpg" style="width:100%">
    <img src="/i/photo/wuhan.jpg" style="width:100%">
    <img src="/i/photo/shanghai-1.jpg" style="width:100%">
  </div>  
  <div class="column">
    <img src="/i/photo/shanghai.jpg" style="width:100%">
    <img src="/i/photo/wuhan.jpg" style="width:100%">
    <img src="/i/photo/beijing.jpg" style="width:100%">
    <img src="/i/photo/shenzhen.jpg" style="width:100%">
    <img src="/i/photo/shenzhen-1.jpg" style="width:100%">
    <img src="/i/photo/wuhan-1.jpg" style="width:100%">
    <img src="/i/photo/shenzhen.jpg" style="width:100%">
  </div>
  <div class="column">
    <img src="/i/photo/shanghai-1.jpg" style="width:100%">
    <img src="/i/photo/hangzhou-1.jpg" style="width:100%">
    <img src="/i/photo/shanghai.jpg" style="width:100%">
    <img src="/i/photo/shanghai-2.jpg" style="width:100%">
    <img src="/i/photo/wuhan.jpg" style="width:100%">
    <img src="/i/photo/shanghai-1.jpg" style="width:100%">
  </div>
</div>

</body>
</html>