看了网上的瀑布流教程，自己跟着写了遍，然后总结了下知识点
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <script type="text/javascript" src="https://www.jb51.net/jquery-1.8.3.min.js"/></script> <script type="text/javascript" src="https://www.jb51.net/script2.js"/></script> <title></title> <style type="text/css"> *{padding: 0;margin:0;} #main{ margin-top: 10px; position: relative; } .pin{ margin:0; padding:0 0 5px 3px; float:left; } .box{ padding: 10px 5px 0 5px; border:1px solid #ccc; box-shadow: 0 0 6px #ccc; border-radius: 5px; } .box img{ border:0; margin:0; width:200px; height:auto; } </style> </head> <body> <div> <div> <div> <img src="https://www.jb51.net/images/1.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/2.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/3.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/4.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/5.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/6.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/7.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/8.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/9.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/1.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/2.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/3.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/4.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/5.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/6.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/7.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/8.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/9.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/1.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/2.jpg"/> </div> </div> <div> <div> <img src="https://www.jb51.net/images/3.jpg"/> </div> </div> </div> </body> </html>
用js实现部分：
window.onload=function(){ waterfall('main','box'); var dataimg={'data':[{'src':'1.jpg'},{'src':'2.jpg'},{'src':'3.jpg'},{'src':'4.jpg'},{'src':'5.jpg'},{'src':'6.jpg'},{'src':'7.jpg'},{'src':'8.jpg'},{'src':'9.jpg'}]}; window.onscroll=function() { if(checkscrollside()) { var main= document.getElementById('main'); for(var i=0;i<dataimg.data.length;i++) { var pin=document.createElement('div'); pin.className='pin'; main.appendChild(pin); var box=document.createElement('div'); box.className='box'; pin.appendChild(box); var img=document.createElement('img'); img.src='images/'+dataimg.data[i].src; box.appendChild(img); } waterfall('main','box'); }; } } function $$(clsName,ele) { //如果当前浏览器支持通过类名获取元素，直接返回 if(document.getElementsByClassName) { return(ele||document).getElementsByClassName(clsName); } else { //尽量把这些量存放在变量中，否则 //例如循环不用len，而用nodes.length，会每一次循环都遍历一次 var nodes=(ele||document).getElementsByTagName("*"), eles=[], len=nodes.length i, j, currNode, clsNames, clsLen; for(i=0;i<len;i++) { currNode=nodes[i]; clsNames=currNode.className.split(' '); clsLen=clsNames.length; for(j=0;j<clsLen;j++) { if(clsNames[j]==clsName) { eles.push(currNode); break; } } } return eles; } } //知识点一：js中通过属性offset--等，但padding,margin等只能获取在内联html中有的样式， //因此，下面这个函数是获取css样式的通用函数。 var getStyle = function(dom, attr) { return dom.currentStyle ? dom.currentStyle[attr] : getComputedStyle(dom, false)[attr]; } function waterfall(parent,box){ var main=document.getElementById(parent); var boxes=$$(box,main); var pins=$$('pin',main); //console.log(boxes.length); var pinw=pins[0]; var boxw=boxes[0].offsetWidth+parseInt(getStyle(pinw,'paddingLeft')); console.log(boxes[0].clientWidth); //console.log(boxw+','+main.clientWidth+','+main.offsetWidth+','+getStyle(boxes[0],'margin')); var cols=Math.floor(document.documentElement.clientWidth/boxw); console.log(cols); main.style.width=cols*boxw+'px'; var boxesh=[]; for(var i=0;i<boxes.length;i++){ if(i<cols){ boxesh.push(boxes[i].offsetHeight+parseInt(getStyle(pinw,'paddingBottom'))); } else{ var minh=Math.min.apply(null,boxesh); var index=getMinIndex(boxesh,minh); boxes[i].style.position='absolute'; boxes[i].style.top=minh+'px'; boxes[i].style.left=index*boxw+'px'; boxesh[index]+=boxes[i].offsetHeight+parseInt(getStyle(pinw,'paddingLeft')); } } } function getMinIndex(arr,val){ for(var i=0;i<arr.length;i++){ if(arr[i]==val) return i; } } function checkscrollside(){ var main=document.getElementById('main'); var aPin=$$('pin',main); console.log(aPin.length); var lastPinH=aPin[aPin.length-1].offsetTop+Math.floor(aPin[aPin.length-1].offsetHeight/2); var scrollTop=document.documentElement.scrollTop||document.body.scrollTop; var documentH=document.documentElement.clientHeight;//页面高度 return (lastPinH<scrollTop+documentH)?true:false; }
用jQuery实现部分：