DOCTYPE html>
html>
    head>
        meta charset="utf-8" />
        meta name="viewport" content="width=device-width, initial-scale=1">
        title>title>
        script src="jquery-3.5.1.min.js" type="text/javascript" charset="utf-8">script>

        style type="text/css">
            #box1 {
                background-color: yellow;
                height: 200px;
                width: 200px;
            }

            #box2 {
                background-color: red;
                height: 100px;
                width: 100px;
                position: relative;
                margin-top: 50px;
                left: 50px;
            }
        style>

        script type="text/javascript">
            $(document).ready(function() {
                // 只能获取不能设置
                $("#o-left-set").click(function() {
                    $("#box2").offset().left = 30;
                });
                // 距离页面最左侧的距离 和有没有定位没有关系
                $("#o-left-get").click(function() {
                    $("#p1").text("offset().left获取" + $("#box2").offset().left);
                });
                $("#p-left-get").click(function() {
                    $("#p2").text("position().left获取" + $("#box2").position().left);
                });
                $("#o-top-get").click(function() {
                    $("#p3").text("offset().top获取" + $("#box2").offset().top);
                });
                $("#p-top-get").click(function() {
                    $("#p4").text("position().top获取" + $("#box2").position().top);
                });
            });
        script>
    head>
    body>
        button type="button" id="o-left-set">offset().left设置button>
        button type="button" id="o-left-get">offset().left获取button>
        button type="button" id="p-left-get">position().left获取button>
        button type="button" id="o-top-get">offset().top获取button>
        button type="button" id="p-top-get">position().top获取button>
        div id="box1">
            div id="box2">

            div>
        div>
        p id="p1">p>
        p id="p2">p>
        p id="p3">p>
        p id="p4">p>
    body>
html>