code组件的复制功能兼容在http访问时无clipboard的情况

src/code/index.js

@@ -212,7 +212,18 @@ class Code extends Component {
   }
 
   copyCode() {
-    navigator.clipboard.writeText(this.code)
+    if (navigator.clipboard) {
+      navigator.clipboard.writeText(this.code)
+    } else {
+      let ta = document.createElement('textarea')
+      ta.style.position = 'fixed'
+      ta.style.left = '-2000px'
+      ta.value = this.code
+      this.root.appendChild(ta)
+      ta.select()
+      document.execCommand('copy')
+      ta.remove()
+    }
     layer.toast('复制到粘贴板成功', 'success')
   }