修复复制问题

dbsyncer-web/src/main/resources/static/js/license/license.js

@@ -29,24 +29,27 @@ $(function () {
     }
 
     document.getElementById("copyBtn").addEventListener('click', async event => {
-        if (!navigator.clipboard) {
-            // Clipboard API not available
-            bootGrowl("非常抱歉，当前浏览器不支持复制机器码，请手动复制", "danger");
-            return;
-        }
+        //Get the copied text
+        const text = document.getElementById("licenseKey").value;
+        fallbackCopyTextToClipboard(text);
+    });
+
+    // 旧浏览器的回退方案
+    function fallbackCopyTextToClipboard(text) {
+        var textArea = document.createElement("textarea");
+        textArea.value = text;
+        document.body.appendChild(textArea);
+        textArea.focus();
+        textArea.select();
         try {
-            //Get the copied text
-            const text = document.getElementById("licenseKey").value;
-            if (isBlank(text)) {
-                bootGrowl("功能暂未开放.", "danger");
-                return;
-            }
-            await navigator.clipboard.writeText(text);
-            bootGrowl("复制机器码成功！", "success");
+            var successful = document.execCommand('copy');
+            var msg = successful ? '成功' : '失败';
+            console.log('复制' + msg);
         } catch (err) {
-            console.error('Failed to copy!', err);
+            console.error('复制失败', err);
         }
-    });
+        document.body.removeChild(textArea);
+    }
 
     $("#fileLicense").fileinput({
         theme: 'fas',