登录框鼠标拖拽效果

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>登录框鼠标拖拽效果</title>
    <style type="text/css">
        body {
            background: url("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1488778794834&di=e97c96dfe7860297d1968c30adc862a2&imgtype=0&src=http%3A%2F%2Fpic1.5442.com%3A82%2F2015%2F0409%2F01%2F15.jpg%2521960.jpg") no-repeat top center #ffffff;
            background-size: 100%;
            padding: 0;
            margin: 0;
            font-size: 12px;
            font-family: "微软雅黑", sans-serif;
        }
        .ui-dialog {
            width: 380px;
            position: absolute;
            z-index: 9000;
            top: 100px;
            left: 100px;
            border: 1px solid #d5d5d5;
            background-color: #ffffff;
            /*display: none;*/
        }
        .ui-dialog-title {
            height: 48px;
            line-height: 48px;
            padding-left: 20px;
            color: #535353;
            font-size: 16px;
            background-color: #f5f5f5;
            border-bottom: 1px solid #efefef;
            cursor: move;
        }
        .ui-dialog-title-closebutton {
            width: 16px;
            height: 16px;
            display: inline-block;
            position: absolute;
            right: 20px;
            color: #000;
            text-decoration: unset;
        }
        .ui-dialog-title-closebutton:hover {
           color: #4ca8ff;
        }
        .ui-dialog-content {
            padding: 15px 20px;
        }
        .ui-dialog-pt15 {
            padding-top: 15px;
        }
        .ui-dialog-l40 {
            height: 40px;
            line-height: 40px;
            text-align: right;
        }
        .ui-dialog-input {
            width: 100%;
            height: 40px;
            margin: 0;
            padding: 0;
            border:1px solid #d5d5d5;
            font-size: 16px;
            color: #c1c1c1;
            text-indent: 25px;
            outline: none;
        }
        .ui-dialog-input-username {
            background: url("images/input_username.png") no-repeat 2px;
        }
        .ui-dialog-input-password {
            background: url("images/input_password.png") no-repeat 2px;
        }
        .ui-dialog-submit {
            width: 100%;
            height: 50px;
            background: #3b7ae3;
            border: none;
            font-size: 16px;
            color: #ffffff;
            outline: none;
            text-decoration: none;
            display: block;
            text-align: center;
            line-height: 50px;
        }
        .ui-dialog-submit:hover {
            background: #3f81b0;
        }
        .ui-mask {
            width: 100%;
            height: 100%;
            background: #000;
            opacity: 0.4;
            position: absolute;
            top: 0;
            left: 0;
            z-index: 8000;
            display: none;
        }
        .link {
            text-align: right;
            line-height: 20px;
            padding-right: 40px;
        }
    </style>
</head>



<body>

    <div id="dialog">
        <div id="dialogTitle">
            登录
            <!-- 右上角的关闭按钮 -->
            <a href="javascript:hideDialog();">X</a>
        </div>
        <div>
            <div class="ui-dialog-l40 ui-dialog-pt15">
                <input class="ui-dialog-input ui-dialog-input-username" type="input" placeholder="手机/邮箱/用户名" />
            </div>
            <div class="ui-dialog-l40 ui-dialog-pt15">
                <input class="ui-dialog-input ui-dialog-input-password" type="input" placeholder="密码" />
            </div>
            <div>
                <a href="#">忘记密码</a>
            </div>
            <div>
                <a href="#">登录</a>
            </div>
            <div>
                <a href="#">立即注册</a>
            </div>
        </div>
    </div>

    <div id="mask"></div>
    <div>
        <a href="javascript:showDialog();" style=" text-decoration: unset;color: #4ca8ff">登录</a>
    </div>

    <script type="text/javascript">
        // 获取元素对象
        function g(id) {
            return document.getElementById(id);
        }
        // 自动居中函数 -- 登录浮层
        // el {Element}
        function autoCenter(el) {
            // 获得可视区域的宽和高
            var bodyW = document.documentElement.clientWidth;
            var bodyH = document.documentElement.clientHeight;
            // 获得元素 el 的宽和高
            var elW = el.offsetWidth;
            var elH = el.offsetHeight;
            // 设置元素的 style 样式
            el.style.left = (bodyW - elW) / 2 + 'px';
            el.style.top = (bodyH - elH) / 2 + 'px';
        }
        // 扩展元素到整个可视区域 -- 遮罩层
        // el {Element}
        function fillToBody(el) {
            // 将元素的宽和高设置的和可视区域一样
            el.style.width = document.documentElement.clientWidth + 'px';
            el.style.height = document.documentElement.clientHeight + 'px';
        }
        // 定义全局变量
        var mouseOffsetX = 0;
        var mouseOffsetY = 0;
        var isDragging = false;
        // 鼠标事件1 -- 在标题栏上按下
        // 计算鼠标相对拖拽元素的的左上角的坐标, 并且标记元素为可拖动
        g('dialogTitle').addEventListener('mousedown', function(e) {
            var e = e || window.event;
            // 用鼠标按下时的坐标减去 dialog 的左上角坐标
            mouseOffsetX = e.pageX - g('dialog').offsetLeft;
            mouseOffsetY = e.pageY - g('dialog').offsetTop;
            isDragging = true;
        });
        // 鼠标事件2 -- 鼠标移动
        document.onmousemove = function(e) {
            var e = e || window.event;
            // 鼠标当前位置
            var mouseX = e.pageX;
            var mouseY = e.pageY;
            // 鼠标从单击时至当前时刻移动的距离
            var moveX = 0;
            var moveY = 0;
            if (isDragging === true) {
                moveX = mouseX - mouseOffsetX;
                moveY = mouseY - mouseOffsetY;
                // 范围限定
                // moveX > 0 且 moveX < (页面最大宽度 - 浮层宽度)
                // moveY > 0 且 moveY < (页面最大宽度 - 浮层高度)
                var pageWidth = document.documentElement.clientWidth;
                var pageHeight = document.documentElement.clientHeight;
                // 登录浮层的宽、高
                var dialogWidth = g('dialog').offsetWidth;
                var dialogHeight = g('dialog').offsetHeight;
                var maxX = pageWidth - dialogWidth;
                var maxY = pageHeight - dialogHeight;
                moveX = Math.min(maxX, Math.max(0, moveX));
                moveY = Math.min(maxY, Math.max(0, moveY));
                g('dialog').style.left = moveX + 'px';
                g('dialog').style.top = moveY + 'px';
            }
        };
        // 鼠标事件3 -- 鼠标松开
        document.onmouseup = function() {
            isDragging = false;
        };
        // 展现登录浮层
        function showDialog() {
            g('dialog').style.display = 'block';
            g('mask').style.display = 'block';
            autoCenter(g('dialog'));
            fillToBody(g('mask'));
        }
        // 隐藏登录浮层
        function hideDialog() {
            g('dialog').style.display = 'none';
            g('mask').style.display = 'none';
        }
        window.onresize = function() {
            autoCenter(g('dialog'));
            fillToBody(g('mask'));
        };
        showDialog();
        autoCenter(g('dialog'));
    </script>

</body>
</html>

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