瀑布流布局

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>瀑布流</title>
</head>

<style>
  * {
    margin: 0;
    padding: 0;
  }

  #container {
    position: relative;
  }

  .box {
    float: left;
    width: 350px;
    padding: 5px;
  }

  img {
    width: 100%;
  }
</style>

<body>
  <div id="container">
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\Sketchpad.png">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\cat.jpg">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\th1.jpg">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\test.jpg">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\查看.jpg">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\下载.png">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\th1.jpg">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\test.jpg">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\查看.jpg">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\下载.png">
    </div>
    <div class="box">
      <img src="C:\Users\JLZ\Pictures\test.jpg">
    </div>
  </div>
</body>

<script>
  window.onload = () => {
    imgLocation('container', 'box')
  }

  function imgLocation(parent, content) {
    const cparent = document.getElementById(parent)
    const ccontent = getChildElement(cparent, content)

    const imgWidth = ccontent[0].offsetWidth
    const num = Math.floor(document.documentElement.clientWidth / imgWidth)
    cparent.style.width = `${imgWidth * num}px`

    const BoxHeightArr = []
    for (var i = 0; i < ccontent.length; i++) {
      if (i < num) {
        //第一行的图片
        BoxHeightArr.push(ccontent[i].offsetHeight)
        // 起初通过.offsetHeight获取的高度与实际高度不一致，原因在于left的div里有img
        // 必须等到页面加载完毕之后才能正确获取content的高度，所以在onload方法里获取content高度才是实际的高度
        // console.log(ccontent[i].offsetHeight);
      }
      else { 
        const minHeight = Math.min.apply(null, BoxHeightArr)
        const minIndex = BoxHeightArr.indexOf(minHeight)
        //摆放图片的位置
        ccontent[i].style.position = 'absolute'
        ccontent[i].style.top = minHeight + 'px'
        ccontent[i].style.left = ccontent[minIndex].offsetLeft + 'px'
        //更新这一列的高度
        BoxHeightArr[minIndex] = BoxHeightArr[minIndex] + ccontent[i].offsetHeight
      }
    }
  }

  function getChildElement(parent, child) {
    const childArr = []
    const allChild = parent.getElementsByTagName('*')
    for (var i = 0; i < allChild.length; i++) {
      if (allChild[i].className === child) {
        childArr.push(allChild[i])
      }
    }
    return childArr
  }
</script>
</html>