js实现模仿广告弹出并关闭弹窗

css部分

<style>
        .box{
            position:relative;
            width: 74px;
            height: 88px;
            border: 1px solid #ccc;
            margin: 100px auto;
            font-size: 12px;
            text-align: center;
            color: #f40;
        }
        .close-btn {
            position: absolute;
            top: -1px;
            left: -16px;
            width: 14px;
            height: 14px;
            border: 1px solid #ccc;
            line-height: 14px;
            font-family: Arial, sans-serif;
            cursor: pointer;
        }

        .ima {
            width: 200px;
            height: 275px;
        }
    </style>

html部分

<div class="box">
    我的二维码
    <img class="ima" src="二维码.jpg" alt="">
    <p class="close-btn">x</p>
</div>

javascript部分

<script>
    var btn = document.querySelector('.close-btn');
    var box = document.querySelector('.box');
    btn.onclick = function () {
        box.style.display = 'none';
    }
</script>