前端学习笔记day14 offset client scroll 应用实例一----登录窗口

<!-- <!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        #box {
            width: 200px;
            height: 170px;
            position: absolute;
            margin: 100px;
            background-color: yellow;
        }
        #title {
            width: 100%;
            height: 50px;
            background-color: grey;
            text-align: center;
            line-height: 50px;

        }
        #footer {
            width: 100%;
            height: 120px;
            background-color: pink;

        }
    </style>
</head>
<body>
    <div id='box'>
        <div id='title'>登录窗口</div>
        <div id='footer'></div>
    </div>    
    <script>
        var box = document.getElementById('box');
        var title = document.getElementById('title');
        var footer = document.getElementById('footer');
        title.onmousedown = function(e) {
            e = e || window.event;
            var x = e.pageX - box.offsetLeft;
            var y = e.pageY - box.offsetTop;
            document.onmousemove = function(e) {
                var boxX = e.pageX - x;
                var boxY = e.pageY - y;
                console.log(boxX);
                console.log(boxY);
                box.style.left = boxX - 100 + 'px';
                box.style.top = boxY -100 + 'px';

            }
        }
        document.onmouseup = function(e) {
            document.onmousemove = null;
        }

    </script>
</body>
</html> -->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        #header {
            position: absolute;
            width: 160px;
            height: 90px;
            left: 650px;
            top: 20px;
        }
        #link {
            font-size: 20px;
            text-decoration: none;
            color: #000;
            text-align: center;
        }
        #box {
            width: 460px;
            height: 250px;
            background-color: lightgrey;
            position: absolute;
            margin-left: 500px;
            margin-top: 100px;
            z-index: 2;
            display: none;
        }
        #box div {
            margin-left: 30px;
        }
        #box #title {
            width: 100%;
            height: 40px;
            font-size: 18px;
            text-align: center;
            line-height: 40px;
            margin-left: 0px;
        }

        #box div:nth-child(2) {
            margin-top: 40px;
            width: 300px;
            height: 60px;
        }
        input {
            width: 200px;
            height: 26px;
            border: 0px;
            outline: none;
        }

        #box div:nth-child(4) input {
            margin: 35px 131px;
            height: 29px;
            width: 111px;
            border: 0px;
            outline: none;

        }
        #close {
            width: 40px;
            height: 40px;
            background: rgba(226,219,219,0.6);
            position: absolute;
            right: -9px;
            top: -15px;
            border-radius: 50%;
            font-size: 16px;
            line-height: 40px;
            text-align: center;
        }
        #bg {
            width: 100%;
            height: 100%;
            position: absolute;
            z-index: 1;
            background-color: rgba(226,219,219,0.6);
            display: none;
        }
    </style>
</head>
<body>
    <div id='header'><a href="javascript:void(0);" id='link'>点击，弹出登录框</a></div>
    <div id='box'>
        <div id='title'>登录会员</div>
        <div>用户名: &nbsp;&nbsp;&nbsp;<input type="text" name="" placeholder='请输入用户名'></div>
        <div>密码:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="text" placeholder='请输入密码'></div>
        <div><input type="button" name=""value='登录会员'></div>
        <div id='close'>关闭</div>
    </div>
    <div id='bg'></div>

    <script>
        var link = document.getElementById('link');
        var box = document.getElementById('box');
        var bg = document.getElementById('bg');
        var close = document.getElementById('close');
        link.onclick = function() {
            box.style.display = 'block';
            bg.style.display = 'block';
        }
        box.onmousedown = function(e) {
            var x = e.pageX - box.offsetLeft;
            var y = e.pageY - box.offsetTop;
            document.onmousemove = function(e) {
                var boxX = e.pageX - x;
                var boxY = e.pageY - y;
                box.style.left = boxX - 420 + 'px';
                box.style.top = boxY - 100 + 'px';
            }
        }
        document.onmouseup = function() {
            document.onmousemove = null;
        }
        close.onclick = function() {
            box.style.display = 'none';
            bg.style.display = 'none';
        }
    </script>
</body>
</html>
运行结果：
前端学习笔记day14 offset client scroll 应用实例一----登录窗口

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