<>想要让整个元素移动需要三个事件:

鼠标按下 onmousedown、鼠标移动 onmousemove、鼠标抬起onmouseup

<>html
<div id="login" class="login"> <!-- 点击title拖拽 --> <div id="title" class=
"login-title">登录会员 <!-- title end --> <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>

<>JS
var login = document.querySelector('.login');//获取整个弹框的内容 var title = document.
querySelector('#title'); title.addEventListener('mousedown',function(e){
//当按下鼠标的时候,获取到鼠标在拖拽盒子内的坐标 //鼠标在页面的坐标 - 大盒子距离浏览器左侧的距离 var x = e.pageX - login.
offsetLeft; var y = e.pageY - login.offsetTop; //鼠标移动 document.addEventListener(
'mousemove',move); function move(e){ //拖拽的盒子定位=鼠标在页面的坐标 - 鼠标在拖拽盒子的坐标 login.style
.left = e.pageX - x + 'px'; login.style.top = e.pageY - y + 'px'; }
//当鼠标抬起的时候,将移动事件删除 document.addEventListener('mouseup',function(){ document.
removeEventListener('mousemove',move); }) })
<>CSS部分
<style> *{ padding: 0px; margin: 0px; } .login { display: block; width: 512px;
height: 280px; position: fixed; border: #ebebeb solid 1px; left: 50%; top: 50%;
background: #ffffff; box-shadow: 0px 0px 20px #ddd; z-index: 9999; transform:
translate(-50%, -50%); } .login-title { width: 100%; margin: 10px 0px 0px 0px;
text-align: center; line-height: 40px; height: 40px; font-size: 18px; position:
relative; cursor: move; } .login-input-content { margin-top: 20px; } .login-
button{ width: 50%; margin: 30px auto 0px auto; line-height: 40px; font-size: 14
px; border: #ebebeb 1px solid; text-align: center; } .login-bg { display: none;
width: 100%; height: 100%; position: fixed; top: 0px; left: 0px; background:
rgba(0, 0, 0, .3); } 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
solid1px; width: 40px; height: 40px; border-radius: 20px; } </style>

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