对于许多资源站而言，分享资源都会使用提取码，为方便用户省时省力，建议添加本功能【代码不美，但能实现功能，有问题回复反馈】

效果图

实现代码

CSS部分：

/*
 *作者：xtuku
 *请本CSS代码放置子比主题设置->全局&功能->自定义CSS样式中即可
 */
.but-download .badg {
    position: relative;
    cursor:pointer;
  }

  .but-download .badg::after {
    position: absolute;
    content: " ";
    width: 0;
    height: 0;
    top: -11px;
    left: 50%;
    transform: translateX(-50%);
    border-top: 10px solid rgb(236, 235, 235);
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    transition: .3s;
    opacity: 0;
  }

  .but-download .badg::before {
    content: attr(data-before);
    position: absolute;
    width: 100px;
    height: 31px;
    top: -40px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 14px;
    line-height: 31px;
    border-radius: 4px;
    color: #6c6a6a;
    background-color: rgb(236, 235, 235);
    text-align: center;
    transition: .3s;
    display:none;
  }

  .but-download .badg:hover::after,
  .but-download .badg:hover::before {
    display:block;
  }

JS部分：

/*
 *作者：知新网
 *知新网：xue.777zy.cn
 *请本JavaScript代码放置子比主题设置->全局&功能->自定义javascript代码中即可
 */
if(document.querySelectorAll(".but-download .badg")!=undefined){
     const reg = /[a-zA-z0-9]/ig;
    const copy1 = document.querySelectorAll(".but-download .badg");
    for (let i = 0; i < copy1.length; i++) {
      copy1[i].index = i;
      copy1[i].setAttribute("data-before", "点击复制");
      copy1[i].addEventListener("click", copyOperation);
      copy1[i].addEventListener("mouseout", copyOk);
    }
    function copyOperation() {
      var oInput = document.createElement("input");
      let text = this.innerText;
      text = text.match(reg).join("");
      oInput.value = text;
      document.body.appendChild(oInput);
      oInput.select();
      document.execCommand("Copy");
      oInput.className = "oInput";
      oInput.style.display = "none";
      this.setAttribute("data-before", "已复制");
    }
    function copyOk() {
      setTimeout(() => {
        this.setAttribute("data-before", "点击复制");
      }, 300)
    }
}