HTML DOM getBoundingClientRect()方法

HTML DOM getBoundingClientRect() 方法返回与视口的相对定位。它返回八个属性：左、上、右、下、x、y、宽、高。滚动将改变位置值。

语法:

var rect = div.getBoundingClientRect();

示例:

<!DOCTYPE html>
<html>
<head>
    <title>
        HTML | DOM getBoundingClientRect() Method
    </title>
    <script>
        function myFunction() {
            var div = document.getElementById("myDiv");
            var rectangle = div.getBoundingClientRect();
            x = rectangle.left;
            y = rectangle.top;
            w = rectangle.width;
            h = rectangle.height;
            alert("Left:" + x + ", Top:" + y +
                ", Width:" + w + ", Height:" + h);
        }
    </script>
</head>
 
<body>
    <button onclick="myFunction()">
        GET POSITION
    </button>
    <div style="height:300px;
                width:400px;
                overflow:auto;">
 
        <div id="myDiv" style="width:350px;
                               height:250px;
                               background-color:lightgreen;
                               border:2px SOLID green;">
            Use scrollbar to change the position.
        </div>
        <div style="width:1500px;
                    height:1500px; ">
        </div>
    </div>
    <br>
</body>
</html>