diff --git a/index.html b/index.html
index 07d9acd..54e6301 100644
--- a/index.html
+++ b/index.html
@@ -2476,24 +2476,31 @@ <h2 id="mermaid-requirement-diagram">Mermaid Requirement Diagram</h2>
 
   document.querySelectorAll('pre > code').forEach(function(e) {
     let codeText = '';
-    e.childNodes.forEach(function(c) {
-      c.childNodes.forEach(function(n, i) {
-        if (i === 0) {
-          return
-        }
-        codeText += n.innerText;
-      })
-    })
-    let copyElement = document.createElement('div');
-    copyElement.innerHTML = `<div class="pre-code-copy">
-		  <textarea>${codeText}</textarea>
-		  <span onmouseover="this.setAttribute('title', '复制')" onclick="this.previousElementSibling.select();document.execCommand('copy');this.setAttribute('title', '已复制')">
-			  <svg viewBox="0 0 32 32"><path d="M27.429 0h-19.143c-0.157 0-0.286 0.129-0.286 0.286v2c0 0.157 0.129 0.286 0.286 0.286h17.714v24.571c0 0.157 0.129 0.286 0.286 0.286h2c0.157 0 0.286-0.129 0.286-0.286v-26c0-0.632-0.511-1.143-1.143-1.143zM22.857 4.571h-18.286c-0.632 0-1.143 0.511-1.143 1.143v18.954c0 0.304 0.121 0.593 0.336 0.807l6.189 6.189c0.079 0.079 0.168 0.143 0.264 0.196v0.068h0.15c0.125 0.046 0.257 0.071 0.393 0.071h12.096c0.632 0 1.143-0.511 1.143-1.143v-25.143c0-0.632-0.511-1.143-1.143-1.143zM10.214 28.293l-3.075-3.079h3.075v3.079zM21.429 29.429h-8.929v-5.071c0-0.789-0.639-1.429-1.429-1.429h-5.071v-15.786h15.429v22.286z"></path></svg>
-		  </span>
-		</div>`;
-    e.parentNode.insertBefore(copyElement.firstChild, e);
+    Array.from(e.childNodes).forEach(function(c) {
+      if (c.nodeName === '#text') {
+        codeText += c.nodeValue;
+      } else {
+        Array.from(c.childNodes).forEach(function(n, i) {
+          if (i !== 0) {
+            codeText += n.textContent;
+          }
+        });
+      }
+    });
+    let textarea = document.createElement('textarea');
+    textarea.value = codeText;
+
+    const copyElement = document.createElement("div");
+    copyElement.className = "pre-code-copy";
+    copyElement.innerHTML = `
+	  <span onmouseover="this.setAttribute('title', '复制')" onclick="this.previousElementSibling.select();document.execCommand('copy');this.setAttribute('title', '已复制')">
+		  <svg viewBox="0 0 32 32"><path d="M27.429 0h-19.143c-0.157 0-0.286 0.129-0.286 0.286v2c0 0.157 0.129 0.286 0.286 0.286h17.714v24.571c0 0.157 0.129 0.286 0.286 0.286h2c0.157 0 0.286-0.129 0.286-0.286v-26c0-0.632-0.511-1.143-1.143-1.143zM22.857 4.571h-18.286c-0.632 0-1.143 0.511-1.143 1.143v18.954c0 0.304 0.121 0.593 0.336 0.807l6.189 6.189c0.079 0.079 0.168 0.143 0.264 0.196v0.068h0.15c0.125 0.046 0.257 0.071 0.393 0.071h12.096c0.632 0 1.143-0.511 1.143-1.143v-25.143c0-0.632-0.511-1.143-1.143-1.143zM10.214 28.293l-3.075-3.079h3.075v3.079zM21.429 29.429h-8.929v-5.071c0-0.789-0.639-1.429-1.429-1.429h-5.071v-15.786h15.429v22.286z"></path></svg>
+	  </span>`;
+
+    copyElement.insertAdjacentElement("afterbegin", textarea);
+    e.parentNode.insertBefore(copyElement, e);
   });
 </script>
 </body>
 </html>
-<!-- Generated by github.com/GoAid/md-html-cli on 2024-03-25T07:30:43Z (1.176794823s) -->
\ No newline at end of file
+<!-- Generated by github.com/GoAid/md-html-cli on 2024-03-25T08:15:59Z (1.20884487s) -->
\ No newline at end of file