JavaScript實作拖動對話框效果-有解無憂

代碼實作：

<!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>
        * {
            margin: 0;
            top: 0;
        }
        
        .login-btn {
            width: 50px;
            height: 50px;
            line-height: 50px;
            font-size: 16px;
            text-align: center;
            margin: 100px auto;
            background-color: #1E1E1E;
            color: white;
            border-radius: 50%;
        }
        
        .login-btn:hover {
            cursor: pointer;
            background-color: #323233;
            box-shadow: 3px 3px 10px rgba(0, 0, 0, .3);
        }
        
        .bg {
            display: none;
            width: 100%;
            height: 100%;
            position: fixed;
            top: 0;
            left: 0;
            background-color: rgba(0, 0, 0, .4);
        }
        
        .login {
            display: none;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 300px;
            height: 200px;
            background-color: #1E1E1E;
            box-shadow: 4px 4px 15px rgba(0, 0, 0, .3);
        }
        
        .hd {
            position: relative;
            width: 100%;
            height: 26px;
            background-color: #323233;
        }
        
        .hd:hover {
            cursor: move;
        }
        
        .close {
            position: absolute;
            top: 3px;
            right: 5px;
            width: 20px;
            height: 20px;
            background-color: red;
            text-align: center;
            line-height: 20px;
            border-radius: 50%;
            box-shadow: 0 0 5px rgba(0, 0, 0, .7) inset;
        }
        
        .close:hover {
            background-color: yellow;
            cursor: pointer;
        }
    </style>
</head>

<body>
    <div >點擊</div>
    <div ></div>
    <div >
        <div >
            <div >×</div>
        </div>
    </div>
    <script>
        // 獲取元素
        var btn = document.querySelector('.login-btn');
        var bg = document.querySelector('.bg');
        var login = document.querySelector('.login');
        var close = document.querySelector('.close');
        var hd = document.querySelector('.hd');

        // 按下btn，彈出對話框
        btn.addEventListener('click', function() {
            bg.style.display = 'block';
            login.style.display = 'block';
        });

        // 按下close，關閉對話框
        close.addEventListener('click', function() {
            bg.style.display = 'none';
            login.style.display = 'none';
        });

        hd.addEventListener('mousedown', function(e) {
            // 滑鼠按下對話框頂部時，獲取滑鼠到對話框的距離
            var x = e.pageX - login.offsetLeft;
            var y = e.pageY - login.offsetTop;
            // 滑鼠按下并移動時，實時更新對話框的位置
            document.addEventListener('mousemove', move);

            function move(e) {
                login.style.left = e.pageX - x + 'px';
                login.style.top = e.pageY - y + 'px';
            }
            // 滑鼠松開時，移除拖拽的動作
            document.addEventListener('mouseup', function() {
                document.removeEventListener('mousemove', move);
            });
        });
    </script>
</body>

</html>

實作效果：

點擊點擊按鈕，彈出對話框，
按住對話框頂部并移動，實作拖動效果，
點擊對話框右上角×，關閉對話框，

轉載請註明出處，本文鏈接：https://www.uj5u.com/qiye/168778.html

標籤：其他

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