原生JS拖拽

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>

　　

页面效果如下：

 

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

<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>

　　

 转载于：https://blog.csdn.net/weixin_47300932/article/details/110405164