瀑布流我们浏览网站的时候尤其是图片网站，我们会发现大大小小的图片，紧密的排列在一起，就像瀑布一样看着非常舒服，虽然css

我们浏览网站的时候尤其是图片网站，我们会发现大大小小的图片，紧密的排列在一起，就像瀑布一样看着非常舒服，虽然css可以通过cloums来指定，像我们这次的图片项目用的就是css实现的，最后布局是用grid布局写的，最后比较懒，就没有改成js实现的瀑布流，因为其比较耗性能而且每次都会重排，用户体验不好，所以更多的还是用js去写，这里就来分享一下吧。

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>瀑布流</title>
    <style>
        * {
            padding: 0;
            margin: 0;
            border: none;
        }

        img {
            width: 200px;
            vertical-align: top;
        }

        #main {
            position: relative;
        }

        .box {
            float: left;
            padding: 15px 0 0 15px;
        }

        .pic {
            padding: 10px;
            border: 1px solid #ccc;
        }

        .clearFloat::after {
            content: "";
            display: block;
            clear: both;
        }
    </style>
</head>

<body>
    <button onclick="sureFn()">确定</button>
    <div id="main" class="clearFloat">
        <div class="box">
            <div class="pic">
                <img src="./img/huidilogo.png" alt="">
            </div>
        </div>
        <div class="box">
            <div class="pic">
                <img src="./img/613927.jpg" alt="">
            </div>
        </div>
        <div class="box">
            <div class="pic">
                <div class="" style="display: grid;">
                    <img src="./img/677283.jpg" alt="">
                    <span>123</span>
                </div>
            </div>
        </div>
        <div class="box">
            <div class="pic">
                <img src="./img/680381.png" alt="">
            </div>
        </div>
        <div class="box">
            <div class="pic">
                <img src="./img/911401.jpg" alt="">
            </div>
        </div>
        <div class="box">
            <div class="pic">
                <img src="./img/huidilogo.png" alt="">
            </div>
        </div>
        <div class="box">
            <div class="pic">
                <img src="./img/huidilogo.png" alt="">
            </div>
        </div>
        <div class="box">
            <div class="pic">
                <img src="./img/613927.jpg" alt="">
            </div>
        </div>
        <div class="box">
            <div class="pic">
                <div class="" style="display: grid;">
                    <img src="./img/677283.jpg" alt="">
                    <span>123</span>
                </div>
            </div>
        </div>
    </div>
    <script>
        window.addEventListener("load", function () {
            waterFall('main', 'box', 4);
        });
        //2、加载数据（追加）
        function sureFn() {
                let str = `
            <div class="pic">
                <img src="./img/1.png" alt="">
            </div>
                `
                var newBox = document.createElement('div');
                newBox.className = 'box';
                newBox.innerHTML = str
                document.getElementById('main').appendChild(newBox);
                //重新进行瀑布流布局
                waterFall('main', 'box', 4);
            }
        }
        function waterFall(parentEle, childEle, cols) {
            var father = document.getElementById(parentEle);
            var allBox = document.getElementsByClassName(childEle);
            var boxWidth = allBox[0].offsetWidth;
            var screen = document.documentElement.clientWidth || document.body.clientWidth;
            father.style.width = cols * boxWidth + 'px';
            father.style.margin = '0 auto';
            var heightArr = [], boxHeight = 0, minBoxHeight = 0, minIndex = 0;
            for (let i = 0; i < allBox.length; i++) {
                boxHeight = allBox[i].offsetHeight;
                if (i < cols) {
                    heightArr.push(boxHeight)
                } else { 
                    minBoxHeight = heightArr[minBox(heightArr)];
                    minIndex = minBox(heightArr);
                    allBox[i].style.position = 'absolute';
                    allBox[i].style.left = minIndex * boxWidth + 'px';
                    allBox[i].style.top = minBoxHeight + 'px';
                    heightArr[minIndex] += boxHeight;
                }
            }
        }
        function minBox(box) {
            var j = 0;
            for (i in box) {
                if (box[j] > box[i])
                    j = i
            }
            return j;
        }
    </script>

</body>

</html>

效果图