style代码
<style> * { margin: 0; padding: 0; } .login-header { width: 100%; text-align: center; height: 30px; font-size: 24px; line-height: 30px; } ul, li, ol, dl, dt, dd, div, p, span, h1, h2, h3, h4, h5, h6, a { padding: 0px; margin: 0px; } .login { width: 512px; height: 280px; position: absolute; border: #ebebeb solid 1px; left: 50%; right: 50%; background: #ffffff; box-shadow: 0px 0px 20px #ddd; z-index: 9999; margin-left: -256px; margin-top: 140px; display: none; } .login-title { width: 100%; margin: 10px 0px 0px 0px; text-align: center; line-height: 40px; height: 40px; font-size: 18px; position: relative; cursor: move; -moz-user-select: none; /*火狐*/ -webkit-user-select: none; /*webkit浏览器*/ -ms-user-select: none; /*IE10*/ -khtml-user-select: none; /*早期浏览器*/ user-select: none; } .login-input-content { margin-top: 20px; -moz-user-select: none; /*火狐*/ -webkit-user-select: none; /*webkit浏览器*/ -ms-user-select: none; /*IE10*/ -khtml-user-select: none; /*早期浏览器*/ user-select: none; } .login-button { width: 50%; margin: 30px auto 0px auto; line-height: 40px; font-size: 14px; border: #ebebeb 1px solid; text-align: center; -moz-user-select: none; /*火狐*/ -webkit-user-select: none; /*webkit浏览器*/ -ms-user-select: none; /*IE10*/ -khtml-user-select: none; /*早期浏览器*/ user-select: none; } .login-bg { width: 100%; height: 100%; position: fixed; top: 0px; left: 0px; background: #000000; filter: alpha(opacity=30); -moz-opacity: 0.3; -khtml-opacity: 0.3; opacity: 0.3; display: none; } a { text-decoration: none; color: #000000; } .login-button a { display: block; } .login-input input.list-input { float: left; line-height: 35px; height: 35px; width: 350px; border: #ebebeb 1px solid; text-indent: 5px; } .login-input { overflow: hidden; margin: 0px 0px 20px 0px; } .login-input label { float: left; width: 90px; padding-right: 10px; text-align: right; line-height: 35px; height: 35px; font-size: 14px; } .login-title span { position: absolute; font-size: 12px; right: -20px; top: -30px; background: #ffffff; border: #ebebeb solid 1px; width: 40px; height: 40px; border-radius: 20px; } </style>
盒子代码
<div class="login-header"> <!--如果a的href属性值中.协议名是javascript. 那么点击a标签的时候,就会执行:后面的代码--> <a id="link" href="javascript:;">点击,弹出登录框</a> </div> <div id="login" class="login"> <div id="title" class="login-title">登录会员 <span> <a id="closeBtn" href="javascript:void(0);" class="close-login">关闭</a> </span> </div> <div class="login-input-content"> <div class="login-input"> <label>用户名:</label> <input type="text" placeholder="请输入用户名" name="info[username]" id="username" class="list-input"> </div> <div class="login-input"> <label>登录密码:</label> <input type="password" placeholder="请输入登录密码" name="info[password]" id="password" class="list-input"> </div> </div> <div id="loginBtn" class="login-button"> <a href="javascript:void(0);" id="login-button-submit">登录会员</a> </div> </div> <!-- 遮盖层 --> <div id="bg" class="login-bg"></div>
script代码
<script> // 获取元素 var link = document.getElementById(‘link‘); //点击的文字 var bg = document.getElementById(‘bg‘); //遮盖层 var login = document.getElementById(‘login‘); //登录框 var title = document.getElementById(‘title‘); //登录框的标题 var closeBtn = document.getElementById(‘closeBtn‘); // 需求: // 1.点击文字,展示遮盖层和登录框 // 1.1获取元素 // 1.2 给link注册点击事件 link.onclick = function(){ // 1.3 在事件处理函数中,让login和bg展示出来 login.style.display = ‘block‘; bg.style.display = ‘block‘; } // 2. 鼠标在登录框的头部按下时,可以拖动 // 2.1 给title注册mousedown事件 title.onmousedown = function(e){ // 2.4 获取鼠标在title上按下的坐标 var downX = e.clientX; var downY = e.clientY; // 2.6 获取鼠标按下时,login的初始位置 var posX = login.offsetLeft; var posY = login.offsetTop; // 2.2 在mousedown中给document注册mousemove事件 document.onmousemove = function(e){ //2.3 获取鼠标移动的坐标 var x = e.clientX; var y = e.clientY; // 2.5 计算鼠标移动了多少 移动的坐标- 按下的坐标 var instanceX = x - downX; var instanceY = y - downY; //2.7 计算login最终处于的位置 鼠标移动的距离 + login初始的位置 var targetX = instanceX + posX; var targetY = instanceY + posY; // 3. 限制登录框的位置 // 3.1 获取最小距离和最大距离 var maxX = window.innerWidth - login.offsetWidth -21; //可视区的宽度 - login的宽度 var maxY = window.innerHeight - login.offsetHeight; //可视区的宽度 - login的宽度 // 3.2 判断target是否小于最小距离或者大于最大距离 if(targetX < 0){ targetX = 0; } if(targetY < 21){ targetY = 21; } if(targetX > maxX){ targetX = maxX; } if(targetY > maxY){ targetY = maxY; } //由于target算出来的就是login应该处于的位置,但是在最后渲染的一瞬间,css中的margin又作用到了login的身上,导致位置发生了变化,为了抵消掉css中margin的值,所以应该在最后赋值的那一刻,把margin减掉 login.style.left = targetX + 256 + ‘px‘; login.style.top = targetY - 140 + ‘px‘; } } //2.8 松手,login不在移动 document.onmouseup = function(){ document.onmousemove = null; }</script>
原文地址:https://www.cnblogs.com/f2ehe/p/11865845.html
时间: 2024-10-04 03:55:46