本文实例为大家分享了JS实现拖拽效果的具体代码，供大家参考，具体内容如下

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: 14px; 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 solid 1px; width: 40px; height: 40px; border-radius: 20px; }</style>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。