javascript三大家族之offset demo代码

17-12-23 来源：[db:作者]

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offsetWidth=Width+padding+border+margin; offsetParent是指返回有定位的父级盒子，如果没有的话，返回的是body

offsetTop是指距离定位盒子顶部的距离；offsetLeft是指距离定位盒子左边的距离。以上得到的都是数值类型的数据，demo代码如下：

<!DOCTYPE html>  
<html lang="en">  
<head>  
    <meta charset="UTF-8">  
    <title>Document</title>  
    <style type="text/css">  
        * {  
            margin: 0;  
            padding: 0;  
        }  
        .box {  
            width: 600px;  
            height: 600px;  
            margin: 20px;  
            padding: 20px;  
            border: 1px solid #000;  
            position: absolute;  
        }  
        .box1 {  
            width: 400px;  
            height: 400px;  
            margin: 20px;  
            padding: 20px;  
            border: 1px solid #000;  
        }  
        .box2 {  
            width: 100px;  
            height: 100px;  
            margin: 20px;  
            padding: 20px;  
            border: 1px solid #000;  
        }  
    </style>  
</head>  
<body>  
    <div class="box" id="box">  
        <div class="box1" id="box1">  
            <div class="box2" id="box2"></div>  
        </div>  
    </div>  
    <script type="text/javascript">  
        var box2 = document.getElementById("box2");  
        var box = document.getElementById("box");  
        var box1 = document.getElementById("box1");  
        console.log(box2.offsetWidth);  //offsetWidth=width+padding+border+margin  
        console.log(box.offsetTop); //offsetTop  
        console.log(box1.offsetTop); //offsetTop是相对于有定位盒子的距离  
        console.log(box.offsetLeft);  
        console.log(box1.offsetLeft);//offsetLeft是相对于有定位盒子的距离  
        console.log(typeof(box1.offsetLeft))  
    </script>  
</body>  
</html>

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