拖拽demo--兼容--全局捕获

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <title>Document</title>

    <style>

        * {

            margin: 0;

            padding: 0;

        }

        html,

        body {

            height: 100%;

            overflow: hidden;

        }

        #box {

            position: absolute;

            width: 150px;

            height: 150px;

            background-color: orangered;

        }

    </style>

</head>

<body>

    略略略

    <div id="box"></div>

    <script>

        window.onload = function () {

            var box = document.getElementById("box");

            box.onmousedown = function (e) {

                e = e || window.event;

                var mouseDownPoint = { "x": 0, "y": 0 };

                var boxStartPoint = { "x": 0, "y": 0 };

                boxStartPoint.x = this.offsetLeft;

                boxStartPoint.y = this.offsetTop;

                mouseDownPoint.x = e.clientX;

                mouseDownPoint.y = e.clientY;

                // 使用全局捕获，阻止ie8以下浏览器事件的默认行为

                if (this.setCapture) {

                    this.setCapture();

                }

                document.onmousemove = function (e) {

                    e = e || window.event;

                    var mouseMovePoint = { "x": 0, "y": 0 };

                    mouseMovePoint.x = e.clientX;

                    mouseMovePoint.y = e.clientY;

                    box.style.left = mouseMovePoint.x - mouseDownPoint.x + boxStartPoint.x + "px";

                    box.style.top = mouseMovePoint.y - mouseDownPoint.y + boxStartPoint.y + "px";

                    return false; // 无法禁止ie8以下浏览器事件的默认行为

                }

                document.onmouseup = function () {

                    document.onmousemove = document.onmouseup = null;

                    if (document.releaseCapture) { // 取消全局捕获

                        document.releaseCapture();

                    }

                }

            }

        }

    </script>

</body>

</html>
兼容ie8，使用全局捕获，阻止ie8以下浏览器事件的默认行为
巴特西

拖拽demo--兼容--全局捕获

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