步骤

1. 找到当前主题下的 post.php 在适当的位置添加代码

<div style="padding: 10px 0; margin: 20px auto; width: 100%; font-size:16px; text-align: center;">
    <button id="rewardButton" disable="enable" onclick="var qr = document.getElementById('QR'); if (qr.style.display === 'none') {qr.style.display='block';} else {qr.style.display='none'}">
        <span>打赏</span></button>
    <div id="QR" style="display: none;">
        <div id="wechat" style="display: inline-block">
            <a class="fancybox" rel="group">
                <img id="wechat_qr" src="https://www.wusiqi.cn/WeChatPay.JPG" alt="WeChat Pay"></a>
            <p>微信打赏</p>
        </div>
        <div id="alipay" style="display: inline-block">
            <a class="fancybox" rel="group">
                <img id="alipay_qr" src="https://www.wusiqi.cn/AliPay.JPG" alt="Alipay"></a>
            <p>支付宝打赏</p>
        </div>
    </div>
</div>

2. 添加CSS样式

#QR {
padding-top:20px;
}
QR a {
border:0
}
QR img {
width:180px;
max-width:100%;
display:inline-block;
margin:.8em 2em 0 2em
}
rewardButton {
border:1px solid #ccc;
line-height:36px;
text-align:center;
height:36px;
display:block;
border-radius:4px;
-webkit-transition-duration:.4s;
transition-duration:.4s;
background-color:#fff;
color:#999;
margin:0 auto;
padding:0 25px
}
rewardButton:hover {
color:#f77b83;
border-color:#f77b83;
outline-style:none
}

注：文章来自 https://www.wusiqi.cn/archives/445/