js实现瀑布流布局（无限加载）
本文实例为大家分享了js实现瀑布流布局的具体代码，供大家参考，具体内容如下
1.实现瀑布流布局思路
准备好数据之后
. 绑定滚动事件. 判断页面是否到底（滚动的距离+可是区域的高度 == 最后一个元素的top）. 加载新数据，渲染新页面.重新执行瀑布流效果
2.代码（更换图片路径之后可直接运行）
<!DOCTYPE html><html><head> <meta charset='UTF-8'> <title>Document</title> <style> .cont{margin: 0 auto;background: #ccc;position: relative;} .cont::after{content: '';display: block;clear: both;} .box{float: left;padding: 6px;} .imgbox{border: solid 1px black;padding: 6px;border-radius: 6px;} .imgbox img{width: 200px;display: block;} </style> <script src='https://www.haobala.com/bcjs/data/data.js'></script> <script> // W1. 准备数据 // W2. 绑定滚动事件 // W3. 判断页面是否到底（滚动的距离+可是区域的高度 == 最后一个元素的top） // W4. 加载新数据，渲染新页面 // W5. 重新执行瀑布流效果 onload = function(){ new Waterfall; } class Waterfall{ constructor(){ // 1.选择元素 this.box = document.querySelectorAll('.box'); this.cont = document.querySelector('.cont'); this.clientH = document.documentElement.clientHeight; this.heightArr = []; // 2.补全布局 this.init(); this.addEvent(); } addEvent(){ var that = this; onscroll = function(){ var scrollT = document.documentElement.scrollTop; if(that.clientH + scrollT > that.scrollH-300){ that.render() } } } render(){ for(var i=0;i<data.length;i++){ var img = document.createElement('img') img.src = data[i].src; var imgbox = document.createElement('div') imgbox.className = 'imgbox'; var box = document.createElement('div') box.className = 'box'; imgbox.appendChild(img); box.appendChild(imgbox); this.cont.appendChild(box); } // 初始化所有 this.box = document.querySelectorAll('.box'); this.heightArr = []; // 重新渲染瀑布流结构 this.firstLine(); this.otherLine(); } init(){ // 计算一行最多能放几个，再计算最大宽度 this.clientW = document.documentElement.clientWidth; this.boxW = this.box[0].offsetWidth; this.maxNum = parseInt(this.clientW / this.boxW) this.cont.style.width = this.boxW * this.maxNum + 'px'; // 3. 区分第一行 this.firstLine() // 4. 区分其他行 this.otherLine(); } firstLine(){ // 5. 获取所有元素的高度，存起来 for(var i=0;i<this.maxNum;i++){ this.heightArr.push(this.box[i].offsetHeight); } } otherLine(){ for(var i=this.maxNum;i<this.box.length;i++){ // 6. 拿到第一行所有的高度 // console.log(this.heightArr) // 计算最小值和最小值的索引 // var min = getMin(this.heightArr); // var min = Math.min.apply(null,this.heightArr); var min = Math.min(...this.heightArr); var minIndex = this.heightArr.indexOf(min); // console.log(minIndex); // 7. 设置元素的定位 this.box[i].style.position = 'absolute'; // 8. 设置元素的top和left this.box[i].style.top = min + 'px'; this.box[i].style.left = minIndex * this.boxW + 'px'; // 9. 修改最小值 this.heightArr[minIndex] += this.box[i].offsetHeight; } this.scrollH = document.documentElement.scrollHeight; } } function getMin(arr){ // 先对数组进行截取（为了深拷贝） // 然后对截取出的新数组排序 // 找第0位 // 返回出去 return arr.slice(0).sort((a,b)=>a-b)[0]; } </script></head><body> <div class='cont'> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/4.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/2.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/3.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/5.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/1.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/6.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/7.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/8.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/9.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/10.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/4.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/2.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/3.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/5.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/1.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/6.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/7.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/8.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/9.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/10.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/4.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/2.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/3.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/5.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/1.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/6.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/7.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/8.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/9.jpg' alt=''> </div> </div> <div class='box'> <div class='imgbox'> <img src='https://www.haobala.com/imgs/10.jpg' alt=''> </div> </div> </div></body></html>
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