JS瀑布流布局

好久没有更新博客喽，今天来说一个瀑布流布局。
瀑布流在很多网站已有很多，现在只说一下简单的实现原理吧，
1、计算一行可以排放几个元素
2、建立一个数组用于存放第一行的每个元素的高度。
3、得到数组中的最少值和索引
4、设置第二行的第一个元素的TOP值为数组中的最小值，同时设置它的LEFT值为第一行索引元素的LEFT值
5、将数组为索引值的元素设置为(第四条中的top值加它的高度)
效果如下图：
JS瀑布流布局
代码如下：
<!DOCTYPE html>

<html>

<head lang="en">

    <meta charset="UTF-8">

    <title></title>

    <style>

        * {

            margin: ;

            padding: ;

        }

        #main {

            position: relative;

        }

        .box {

            padding: 15px   15px;

            float: left;

        }

        .pic {

            padding: 10px;

            border: 1px solid #ccc;

            border-radius: 5px;

            box-shadow: 0px 0px 5px #ccc;

        }

    </style>

</head>

<body>

<div id="main">

    <div class="box">

        <div class="pic">

            <img src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/01.jpg"

                 alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/02.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/03.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/04.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/05.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/06.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/07.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/10.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

    <div class="box">

        <div class="pic">

            <img

                    src="http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/09.jpg"

                    alt=""/>

        </div>

    </div>

</div>

</body>

<script>

    window.onload = function () {

        waterfall('main', 'box');

        var data = {'data': [

            {'src': 'http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/11.jpg'},

            {'src': 'http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/12.jpg'},

            {'src': 'http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/14.jpg'},

            {'src': 'http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/15.jpg'},

            {'src': 'http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/01.jpg'},

            {'src': 'http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/10.jpg'},

            {'src': 'http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/02.jpg'},

            {'src': 'http://www.17sucai.com/preview/1/2013-05-06/%E7%80%91%E5%B8%83%E6%B5%81/images/pic/03.jpg'}

        ]};

        window.onscroll = function () {

            if (checkScrollSlide()) {

                var oParent = document.getElementById('main');

                for (var i = ; i < data.data.length; i++) {

                    var tBox = document.createElement('div');

                    tBox.className = 'box';

                    oParent.appendChild(tBox);

                    var tPic = document.createElement('div');

                    tPic.className = 'pic';

                    tBox.appendChild(tPic);

                    var tImg = document.createElement('img');

                    tImg.src = data.data[i].src;

                    tPic.appendChild(tImg);

                }

                waterfall('main', 'box');

            }

        };

    };

    function waterfall(parent, box) {

        var oParent = document.getElementById(parent);

        var oBoxs = getByClass(oParent, box);

        //计算列数

        var oBoxW = oBoxs[].offsetWidth;

        var cols = Math.floor(document.documentElement.clientWidth / oBoxW);

        //set main width

        //oParent.style.width=cols*oBoxW+'px';

        oParent.style.cssText = 'width:' + cols * oBoxW + 'px;margin:0 auto;';

        var hArr = [];

        for (var i = ; i < oBoxs.length; i++) {

            if (i < cols) {

                hArr.push(oBoxs[i].offsetHeight);

            } else {

                var minH = Math.min.apply(null, hArr);

                var index = getArrayIndex(hArr, minH);

                oBoxs[i].style.position = 'absolute';

                oBoxs[i].style.top = minH + 'px';

                oBoxs[i].style.left = oBoxs[index].offsetLeft + 'px';

                //主要用于进行替换位置数组中高度 让以后的图片进行按这个高度

                //进行排序

                hArr[index] = minH + oBoxs[i].offsetHeight;

            }

        }

    }

    function getByClass(parent, clsName) {

        var boxArray = new Array();

        var oElements = parent.getElementsByTagName('*');

        for (var i = ; i < oElements.length; i++) {

            if (oElements[i].className == clsName) {

                boxArray.push(oElements[i]);

            }

        }

        return boxArray;

    }

    function getArrayIndex(arrayy, val) {

        for (var i = ; i < arrayy.length; i++) {

            if (arrayy[i] == val) {

                return i;

            }

        }

    }

    function checkScrollSlide() {

        var oParent = document.getElementById('main');

        var oBoxs = getByClass(oParent, 'box');

        var lastBoxH = oBoxs[oBoxs.length - ].offsetTop + Math.floor(oBoxs[oBoxs.length - ].offsetHeight);

        var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;

        var height = document.body.clientHeight || document.documentElement.clientHeight;

        return lastBoxH < scrollTop + height;

    }

</script>

</html>
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