这两个属性都可以实现多列布局，但是column-width 是响应式的，它可以在小屏幕上自动显示为单列布局
所以指定column-width 比column-count好
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.clm {
column-width: 300px;
}
.clm div {
break-inside: avoid;
}
</style>
</head>
<body>
<div class="clm">
<div class="" style="width: 31px; height: 43px; background: red;"></div>
<div class="" style="width: 33px; height: 53px; background: yellow;"></div>
<div class="" style="width: 63px; height: 36px; background: blue;"></div>
<div class="" style="width: 64px; height: 64px; background: black;"></div>
<div class="" style="width: 45px; height: 27px; background: lightblue;"></div>
<div class="" style="width: 54px; height: 67px; background: lightcoral;"></div>
<div class="" style="width: 54px; height: 67px; background: lightcoral;"></div>
<div class="" style="width: 67px; height: 98px; background: lightcyan;"></div>
<div class="" style="width: 23px; height: 78px; background: lightgoldenrodyellow;"></div>
<div class="" style="width: 54px; height: 23px; background: lightgray;"></div>
<div class="" style="width: 78px; height: 89px; background: lightsalmon;"></div>
</div>
</body>
</html>