直接下载文件覆盖掉download.php即可（文件路径：/wp-content/themes/zibll/pages/download.php），更新前记得备份！记得备份！记得备份！不然就没后悔药吃了！

JS代码

<!--下载页面密码复制-->
if(document.querySelectorAll(".but-download .badg")!=undefined){
    const reg = /[a-zA-z0-9]/ig;
    const copy = document.querySelectorAll(".but-download .badg");
    for (let i = 0; i < copy.length; i++) {
      copy[i].index = i;
      copy[i].setAttribute("data-toggle", "tooltip");
      copy[i].setAttribute("data-original-title", "点击复制");
      copy[i].addEventListener("click", copyOperation);
    };
    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-original-title", "已复制");
    };
};