js瀑布流（定位法）

1、首先，自己写好图片路径，引入jquery
<!DOCTYPE html>
<html>

    <head>
        <meta charset="utf-8" />
        <title></title>
        <style type="text/css">
            * {
                padding: 0;
                margin: 0;
            }
            
            ul {
                position: relative;
                width: 860px;
                margin: 0 auto;
                border: 1px solid yellowgreen;
            }
            
            li {
                width: 200px;
                position: absolute;
                list-style: none;
            }
            
            img {
                width: 100%;
                border-radius: 8px;
            }
        </style>
    </head>

    <body>
        <ul>
            <li><img src="img/1.jpg" /></li>
            <li><img src="img/2.jpg" /></li>
            <li><img src="img/3.jpg" /></li>
            <li><img src="img/4.jpg" /></li>
            <li><img src="img/5.jpg" /></li>
            <li><img src="img/6.jpg" /></li>
            <li><img src="img/7.jpg" /></li>
            <li><img src="img/8.jpg" /></li>
            <li><img src="img/9.jpg" /></li>
            <li><img src="img/10.jpg" /></li>
            <li><img src="img/2.jpg" /></li>
            <li><img src="img/3.jpg" /></li>
            <li><img src="img/4.jpg" /></li>
            <li><img src="img/5.jpg" /></li>
            <li><img src="img/6.jpg" /></li>
            <li><img src="img/7.jpg" /></li>
        </ul>
    </body>
    <script type="text/javascript" src="js/jquery.js"></script>
    <script type="text/javascript">
        $(function() {

            lazyLoad("ul", "li", 4, 20, 40).init();
            /*
            wrap:外层的dom
            box:瀑布流的dom
            clonum:列数 ，默认为3行   
            marginLeft：每列，间隔，默认为20
            marginBottom：每行的间隔，默认为20
            startLeft:控制最左边的起始位置，默认不传为0
            * */
            function lazyLoad(wrap, box, clonum, marginLeft, marginBottom,startLeft) {
                var posArr = [];
                var boxList = $(wrap).find(box),
                    boxWidth = boxList.width();
                    clonum = clonum || 3;
                    marginLeft = marginLeft || 20;
                    marginBottom = marginBottom || 20;
                    startLeft = startLeft || 0;
                var fn = {};
                fn.init = function() {
                    for(var i = 0; i < clonum; i++) {
                        posArr.push({
                            "top": 0,
                            "left": boxWidth * i + marginLeft * i + startLeft
                        });
                    }
                    fn.layout();
                };

                fn.layout = function() {
                    var min = 0,
                        max = 0;
                    boxList.each(function(index, ele) {
                        min = fn.getHeight().minIndex;
                        $(ele).css({
                            "top": posArr[min].top,
                            "left": posArr[min].left
                        });
                        posArr[min].top = posArr[min].top * 1 + $(ele).height() * 1 + marginBottom;
                        max = fn.getHeight().maxIndex;
                        /*更新外层的高度*/
                        $(wrap).css({
                            "height": posArr[max].top
                        });

                    });

                };

                fn.getHeight = function() {
                    var minHeight = posArr[0].top,
                        maxHeight = posArr[0].top,
                        minIndex = 0,
                        maxIndex = 0;
                    for(var i = 0; i < posArr.length; i++) {
                        if(minHeight > posArr[i].top) {
                            minHeight = posArr[i].top;
                            minIndex = i;
                        }
                        if(maxHeight < posArr[i].top) {
                            maxHeight = posArr[i].top;
                            maxIndex = i;
                        }
                    }
                    return {
                        "minIndex": minIndex,
                        "maxIndex": maxIndex
                    };
                };

                return fn;
            }

        });
    </script>

</html>