Typecho 简单实现点击复制

<script>
  // 创建隐藏内容的复制按钮
  document.addEventListener("DOMContentLoaded", initCopyButton);
  function initCopyButton() {
    const copyButton = {
      load() {
        document.querySelectorAll("cp").forEach((cp) => this.newButton(cp));
      },
      newButton(cp) {
        const lock = "lock";
        if (cp.getAttribute(lock)) return;
        cp.setAttribute(lock, true);
        cp.style.display = "0";
        let text = cp.getAttribute("text");
        text = text[0] === "\n" ? text.slice(1) : text;
        const button = document.createElement("a");
        button.href = "javascript:void(0);";
        button.innerHTML = cp.getAttribute("name");
        button.className = "btn btn-primary";
        button.style.textAlign = "center";
        button.setAttribute("onclick", "__miragesCustomCopyButtonListener(this)");
        window.__miragesCustomCopyButtonListener = (button) => {
          const lock = "lock";
          if (button.getAttribute(lock)) return;
          button.setAttribute(lock, true);
          const originName = button.innerHTML;
          const actionResult = this.copy(text) ? "成功" : "失败";
          button.innerHTML = "复制" + actionResult;
          setTimeout(() => {
            button.innerHTML = originName;
            button.removeAttribute(lock);
          }, 250);
          return false;
        };
        cp.parentNode.insertBefore(button, cp);
        setTimeout(() => (button.style.width = button.getBoundingClientRect().width + "px"), 100);
      },
      copy(text) {
        let result = false;
        const wrapper = document.createElement("div");
        const target = document.createElement("pre");
        target.textContent = text;
        wrapper.style.opacity = "0";
        wrapper.appendChild(target);
        document.body.appendChild(wrapper);
        try {
          const range = document.createRange();
          range.selectNodeContents(target);
          const selection = window.getSelection();
          selection.removeAllRanges();
          selection.addRange(range);
          document.execCommand("copy", false, text);
          selection.removeAllRanges();
          result = true;
        } catch (e) {
          console.log("copy failed.");
        }
        document.body.removeChild(wrapper);
        return result;
      },
    };
    copyButton.load();
  }
</script>