js实现无限瀑布流实例方法

时间：2021-05-26

瀑布流

是一种常见的网页布局方式，在许多网站中我们都能看到“瀑布流”的效果，其特征是有网页视窗有多个高度不同宽度相同的“块”组成。因其样式酷似飞流直下的瀑布，

故将这种布局方式称为瀑布流。

生活中瀑布流实例：

花瓣网

在css中我们学习过使用Multi-columns来实现瀑布流的效果

通过 Multi-columns 相关的属性column-count、column-gap配合break-inside来实现瀑布流布局。

现在，我来介绍一下如何通过js方式来实现瀑布流

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <style> .cont{ margin: 0 auto; position: relative; } .box{ float: left; padding: 6px; } .imgbox{ border: 1px black solid; border-radius: 6px; padding: 6px; } .imgbox img{ width: 200px; display: block; } </style> <script> onload = function () { new Waterfall(); }; function Waterfall() { this.ocont = document.querySelector(".cont"); this.abox = document.querySelectorAll(".box"); this.heightArr = []; this.init(); //w1准备数据 this.data = this.load(); this.addScroll(); } Waterfall.prototype.load = function(){ return [{img:"images/1.jpg"},{img:"images/2.jpg"},{img:"images/3.jpg"},{img:"images/4.jpg"},{img:"images/5.jpg"},{img:"images/6.jpg"},{img:"images/7.jpg"},{img:"images/8.jpg"},{img:"images/9.jpg"},{img:"images/10.jpg"},] }; Waterfall.prototype.addScroll = function(){ var that = this; onscroll = function () { if (that.isBottom()){ that.data.forEach(val=>{ var img = document.createElement("img"); img.src = val.img; var imgbox = document.createElement("div"); imgbox.className = "imgbox"; var box = document.createElement("div"); box.className = "box"; imgbox.appendChild(img); box.appendChild(imgbox); that.ocont.appendChild(box); }); that.abox = document.querySelectorAll(".box"); that.heightArr = []; that.firstLine(); that.otherLine(); } } }; Waterfall.prototype.isBottom = function(){ var clientH = document.documentElement.clientHeight; var scrollT = document.documentElement.scrollTop; var scrollH = document.documentElement.scrollHeight; if (clientH + scrollT >= scrollH-200){ return true; }else{ return false; } }; Waterfall.prototype.init = function () { this.num = Math.floor(document.documentElement.clientWidth/this.abox[0].offsetWidth); this.ocont.style.width = this.num*this.abox[0].offsetWidth+"px"; //区分第一行 this.firstLine(); //区分最后一行 this.otherLine(); }; Waterfall.prototype.firstLine = function () { for (var i=0;i<this.num;i++){ this.heightArr.push(this.abox[i].offsetHeight); } }; Waterfall.prototype.otherLine = function () { for (var i=this.num;i<this.abox.length;i++){ var min = getMin(this.heightArr); var minIndex = this.heightArr.indexOf(min); //设置定位，left，top this.abox[i].style.position = "absolute"; this.abox[i].style.top = min + "px"; this.abox[i].style.left = minIndex*this.abox[0].offsetWidth+"px"; this.heightArr[minIndex] += this.abox[i].offsetHeight; } }; function getMin(arr) { var myarr = []; arr.forEach(val =>{ myarr.push(val); }); return myarr.sort((a,b)=>a-b)[0]; } </script></head><body><div class="cont"> <div class="box"> <div class="imgbox"> <img src="images/4.jpg" alt=""> </div></div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/4.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/3.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/2.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/1.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/5.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/6.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/7.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/8.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/9.jpg" alt=""> </div> </div> <div class="box"> <div class="imgbox"> <img src="images/10.jpg" alt=""> </div> </div></div></body></html>

以上就是本次介绍的关于js实现无限瀑布流的全部知识点内容，感谢大家的学习和对的支持。

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