原生JS写的一个瀑布流布局-------------提示：需放到服务器下才能运行（XAMPP服务器等）

<!DOCTYPE html>
<html>
<head>
    <title>瀑布流布局</title>
    <meta charset="UTF-8"/>
    <style>
        *{
            padding:0;
            margin:0;
        }
        body{
            font-family:"微软雅黑";
        }
        #oUl{
            width: 1080px;
            overflow: hidden;
            margin: 100px auto 0;
        }
        #oUl li{
            width: 247px;
            list-style: none;
            float: left;
            margin-left: 10px;
        }
        #oUl li div {
            padding: 10px;
            margin-bottom: 10px;
            border:1px solid red;
        }
        #oUl li div img {
            width: 225px;
            display: block;
        }
        #oUl li div p {
            text-align: center;
        }
    </style>
</head>
<body>
    <ul id="oUl">
        <li></li>
        <li></li>
        <li></li>
        <li></li>
    </ul>
</body>
</html>
<script>
    window.onload=function(){
        var oUl=document.getElementById('oUl');
        var aLi=oUl.getElementsByTagName('li');
        var iLen=aLi.length;
        var iPage=2;
        var b=true;

        //初始化
        getList();
        function getList(){
            ajax('get','getPics.php','cpage'+iPage,function(data){
                var data=JSON.parse(data);
                //console.log(data);
                for(var i=0;i<data.length;i++){
                    var _index=getShort();
                    var oDiv=document.createElement('div');
                    var oImg=document.createElement('img');
                    oImg.src=data[i].preview;
                    oImg.style.width='225px';
                    oImg.style.height=data[i].height*(225/data[i].width)+'px';
                    oDiv.appendChild(oImg);
                    var oP=document.createElement('p');
                    oP.innerHTML=data[i].title;
                    oDiv.appendChild(oP);
                    aLi[_index].appendChild(oDiv);
                }
                b=true;
            })
        }


        //获取最小li的高度
        function getShort(){
            var index=0;
            var iH=aLi[index].offsetHeight;
            for(var i=0;i<iLen;i++){
                if(iH>aLi[i].offsetHeight){
                    index=i;
                    iH=aLi[i].offsetHeight;
                }
            }
            return index;
        }

        //加载下一页
        window.onscroll=function(){
            var _index=getShort();
            var oLi=aLi[_index];
            var Scroll=document.documentElement.scrollTop||document.body.scrollTop;
            if(getTop(oLi)+oLi.offsetHeight>document.documentElement.clientHeight+Scroll){
                if(b){
                    b=false;
                    iPage++;
                    getList();
                }
            }
        }


        function getTop(obj){
            var iTop=0;
            while(obj){
                iTop+=obj.offsetHeight;
                obj=obj.offsetParent;
            }
            return iTop;
        }

    }

    function ajax(method,url,data,success){
        var xhr=null;
        if(window.XMLHttpRequest){
            xhr=new XMLHttpRequest();
        }else{
          xhr=new ActiveXObject('Microsoft.XMLHTTP') ;
        }
        if(method=='get'&&data){
            url+='?'+data;
        }
        xhr.open(method,url,true);
        if(method=='get'){
            xhr.send();
        }else{
            xhr.setRequestHeader('content-type', 'application/x-www-form-urlencoded');
            xhr.send(data);
        }
        xhr.onreadystatechange=function(){
            if(xhr.readyState==4){
                if(xhr.status==200){
                    success&&success(xhr.responseText);
                }else{
                    alert('Eorre'+xhr.status);
                }
            }
        }
    }
</script>