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js實現無限瀑布流實例方法

發布時間：2020-09-19 08:47:38 來源：腳本之家 閱讀：169 作者：本山耀司 欄目：web開發

瀑布流

是一種常見的網頁布局方式，在許多網站中我們都能看到“瀑布流”的效果，其特征是有網頁視窗有多個高度不同寬度相同的“塊”組成。因其樣式酷似飛流直下的瀑布，

故將這種布局方式稱為瀑布流。

生活中瀑布流實例：

花瓣網

js實現無限瀑布流實例方法

在css中我們學習過使用Multi-columns來實現瀑布流的效果

通過 Multi-columns 相關的屬性 column-count、column-gap 配合 break-inside 來實現瀑布流布局。

現在，我來介紹一下如何通過js方式來實現瀑布流

<!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準備數據
       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";
       //區分第一行
       this.firstLine();
       //區分最后一行
       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);
         //設置定位，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>

以上就是本次介紹的關于js實現無限瀑布流的全部知識點內容，感謝大家的學習和對億速云的支持。

向AI問一下細節
推薦閱讀：
  1. Vue.js 實例方法
  2. 原生js實現橫向瀑布流

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