js实现无限瀑布流实例方法

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我们的支持。