用JavaScript和jQuery实现瀑布流

<div id="main"> <div class="box">  <div class="pic"><img src="images/1.jpg" alt=""></div> </div> <div class="box">  <div class="pic"><img src="images/2.jpg" alt=""></div> </div>  ...  ...  ... </div>

*{ margin: 0px; padding: 0px; } #main{ position: relative; } .box{ padding: 15px 0 0 15px; float: left; } .pic{ padding: 10px; border: 1px solid #ccc; border-radius: 5px; box-shadow: 0 0 5px #ccc; }

  //将main下的所有class为box的元素取出来  var oParent = document.getElementById(parent);  var oBox = getByClass(oParent,box);

// 根据class获取元素 function getByClass(parent,clsname){  var arr = [];//用来存储获取到的所有class为box的元素  var oElement = parent.getElementsByTagName('*');  for(var i=0;i<oElement.length;i++){  if(oElement[i].className == clsname){   arr.push(oElement[i]);  }  }  return arr; }

  //计算整个页面显示的列数（页面宽/box的宽）  var oBoxW = oBox[0].offsetWidth;  var cols = Math.floor(document.documentElement.clientWidth/oBoxW);  //设置main的宽  oParent.style.cssText = 'width:' + oBoxW*cols + 'px;margin:0 auto;'; 

//存储每列的高度  var hArr = [];  for(var i=0;i<oBox.length;i++){  if(i<cols){   //第一行图片的高度   hArr.push(oBox[i].offsetHeight);  }else{   var minH = Math.min.apply(null,hArr);   var index = getMinIndex(hArr,minH);   oBox[i].style.position = "absolute";   oBox[i].style.top = minH + 'px';   //oBox[i].style.left = oBoxW*index+'px';   oBox[i].style.left = oBox[index].offsetLeft + 'px';   //更新每列的高度   hArr[index] += oBox[i].offsetHeight;  }  }

//获取每列高度最小的索引值 function getMinIndex(arr,value){  for(var i in arr){  if(arr[i] == value){   return i;  }  } }

  //数据  var dataInt = {'data':[{'src':'1.jpg'},{'src':'2.jpg'},{'src':'3.jpg'},{'src':'4.jpg'}]};　　

  //滚动条滚动时  window.onscroll = function(){  scrollSlide(dataInt);  }　　

//判断是否具有了滚条加载数据块的条件 function checkScrollSlide(parent,clsname){  var oParent = document.getElementById(parent);  var oBox = getByClass(oParent,clsname);  var lastBoxH = oBox[oBox.length-1].offsetTop + Math.floor(oBox[oBox.length-1].offsetHeight/2);  var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;  var height = document.documentElement.clientHeight || document.body.clientHeight;  return (lastBoxH < scrollTop + height)? true:false; }

//滚动条滚动时执行 function scrollSlide(dataInt){  ////判断是否具有了滚条加载数据块的条件  if(checkScrollSlide('main','box')){  var oParent = document.getElementById('main');  //将数据块渲染到当前页面的尾部  for(var i=0;i<dataInt.data.length;i++){   var oBoxs = document.createElement('div');   oBoxs.className = 'box';   oParent.appendChild(oBoxs);   var oPic = document.createElement('div');   oPic.className = 'pic';   oBoxs.appendChild(oPic);   var oImg = document.createElement('img');   oImg.src = 'images/' + dataInt.data[i].src;   oPic.appendChild(oImg);  }  waterfall('main','box');  }

$(window).on('load',function(){  waterfall();  var dataInt={'data':[{'src':'1.jpg'},{'src':'2.jpg'},{'src':'3.jpg'},{'src':'4.jpg'}]};  $(window).on('scroll',function(){  scrollSlide(dataInt);  }) }); function waterfall(){  var $oBox = $('#main>div');  var oBoxW = $oBox.eq(0).outerWidth();  var cols = Math.floor($(window).width()/oBoxW);  $('#main').css({  'width' : cols * oBoxW,  'margin' : '0 auto'  });  var hArr = [];  $oBox.each(function(index,value){  var oBoxH = $oBox.eq(index).height();  if(index<cols){   hArr.push(oBoxH);  }else{   var minH = Math.min.apply(null,hArr);   var minHIndex = $.inArray(minH,hArr);   $(value).css({   'position' : 'absolute',   'top': minH + 15,   'left' : $oBox.eq( minHIndex ).position().left   });   hArr[minHIndex] += $oBox.eq(index).height() + 15;  }  }); } function checkScrollSlide(){  var $lastBox = $('#main>div').last();  var lastBoxH = $lastBox.offset().top + Math.floor($lastBox.height()/2);  var scrollTop = $(window).scrollTop();  var clientH = $(window).height();  return (lastBoxH < scrollTop + clientH) ? true : false; } function scrollSlide(dataInt){  if(checkScrollSlide()){  $.each(dataInt.data,function(index,value){   var $Box = $('<div>').addClass('box').appendTo('#main');   var $Pic = $('<div>').addClass('pic').appendTo($Box);   $('<img>').attr('src','images/' + $(value).attr('src')).appendTo($Pic);  })  waterfall();  } }