Use html to implement an example code for a button with click (show, hide) effects

A share button, a hidden picture (this picture is absolutely positioned in the upper right corner), then click to show, click to hide.

<a href="javascript:;" onclick="document.getElementById(&#39;mcover&#39;).style.display=&#39;block&#39;;">分享到朋友圈</a>
<div id="mcover" onclick="document.getElementById(&#39;mcover&#39;).style.display=&#39;&#39;;" style="display: none;">
     <img src="/public/images/guide.png">
</div>
对应样式如下：
#mcover {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    z-index: 20000;
}
#mcover img {
    position: fixed;
    right: 18px;
    top: 5px;
    width: 260px;
    height: 180px;
    z-index: 999;
}

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