为什么我用jquery写瀑布流是这样的效果？求大神指点！

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>瀑布流</title>
    <script src="jquery-3.1.1.min.js"></script>
    <script src="app.js"></script>
    <link type="text/css" href="style.css" rel="stylesheet">
</head>
<body>
    <div id="container">
        <div class="box">
            <div class="content">
                <img src="img/1.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/2.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/3.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/4.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/5.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/6.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/7.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/8.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/9.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/10.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/11.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/12.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/13.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/14.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/15.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/16.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/17.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/18.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/19.jpg">
            </div>
        </div>
        <div class="box">
            <div class="content">
                <img src="img/20.jpg">
            </div>
        </div>
    </div>

</body>
</html>

*{
    padding:0;
    margin:0;
}
.box{
    position:relative;
    float:left;
}
.content{
    padding:10px;
    border:1px solid #ccc;
    box-shadow:0 0 5px #ccc;
    border-radius:5px;
}
.content img{
    width:190px;
    height:auto;
}

$(document).ready(function(){
    $(window).on("load",function(){
        imgLocation();
    });
});

function imgLocation(){
    var box=$(".box");
    var boxWidth=box.eq(0).width();
    var num=Math.floor($(window).width()/boxWidth);
    var boxArr=[];
    box.each(function(index,value){
        var boxHeight=box.eq(index).height();
        if(index<num){
            boxArr[index]=boxHeight;
    //      console.log(boxHeight);
        }else{
            var minBoxHeight=Math.min.apply(null,boxArr);
            console.log(minBoxHeight);
            var minBoxIndex= $.inArray(minBoxHeight,boxArr);
            $(value).css({
                "position":"absolute",
                "top":minBoxHeight,
                "left":box.eq(minBoxIndex).position.left
            });
            boxArr[minBoxIndex]+=box.eq(index).height();
        }
    });
}

我运行后显示的效果是这样的：图片说明
教程上面的效果是这样的：图片说明
实在是找不到哪里错了。求大神指点！

我跟你的结果是一模一样的，真相只有一个，这教程有问题!!