步骤

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>

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
}