JavaScript实现-拖拽

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            position: relative;
        }

        #box {
            position: absolute;
            left: 0;
            top: 0;
            width: 100%;
            height: 100vh;
            background-color: grey;
            cursor: pointer;
        }
    </style>
</head>

<body>
    <div id="box">
    </div>
    <script>
        function DragHooks() {
            let box = document.querySelector("div")
            box.addEventListener('mousedown', function (e) {
                var firstX = e.clientX;//获得鼠标点击的位置
                var firstY = e.clientY;
                var nowX = box.offsetLeft;//获得div即移动方块的初始位置
                var nowY = box.offsetTop;

                document.onmousemove = function (e) {
                    //更改元素的位置：初始的位置 +鼠标的位置-鼠标在元素内的位置
                    box.style.left = nowX + e.clientX - firstX + 'px';
                    box.style.top = nowY + e.clientY - firstY + 'px';
                    console.log('onmousemove', box.style.left, nowX, e.clientX, firstX)
                }
            })
            //当鼠标按键放开的时候   将鼠标移动事件置为空
            box.addEventListener('mouseup', function () {
                document.onmousemove = null
            })
        }
        DragHooks()
    </script>
</body>

</html>
JavaScript实现-拖拽

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