原生js拖拽DOM节点操作

拖拽

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
     
     
            position: absolute;
            width: 100px;
            height: 100px;
            background: red;
            cursor: move;
        }
    </style>
</head>

<body>
    <div class="box" id="drag"></div>
</body>

</html>
<script>
    window.onload = function () {
     
     
        var drag = document.getElementById('drag');
        // //点击某物体时，用drag对象即可，move和up是全局区域，
        // 也就是整个文档通用，应该使用document对象而不是drag对象(否则，采用drag对象时物体只能往右方或下方移动)  
        drag.onmousedown = function (event) {
     
     
            var event = event || window.event;  //兼容IE浏览器
            //    鼠标点击物体那一刻相对于物体左侧边框的距离=点击时的位置相对于浏览器最左边的距离-物体左边框相对于浏览器最左边的距离
            var diffX = event.clientX - drag.offsetLeft;
            var diffY = event.clientY - drag.offsetTop;
            if (typeof drag.setCapture !== 'undefined') {
     
     
                drag.setCapture();
            }
            document.onmousemove = function (event) {
     
     
                var event = event || window.event;
                var moveX = event.clientX - diffX;
                var moveY = event.clientY - diffY;
                if (moveX < 0) {
     
     
                    moveX = 0
                } else if (moveX > window.innerWidth - drag.offsetWidth) {
     
     
                    moveX = window.innerWidth - drag.offsetWidth
                }
                if (moveY < 0) {
     
     
                    moveY = 0
                } else if (moveY > window.innerHeight - drag.offsetHeight) {
     
     
                    moveY = window.innerHeight - drag.offsetHeight
                }
                drag.style.left = moveX + 'px';
                drag.style.top = moveY + 'px'
            }
            document.onmouseup = function (event) {
     
     
                this.onmousemove = null;
                this.onmouseup = null;
                //修复低版本ie bug  
                if (typeof drag.releaseCapture != 'undefined') {
     
     
                    drag.releaseCapture();
                }
            }
        }
    }
</script>
原生js拖拽DOM节点操作

拖拽

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