Fix Vue setup return object and clean up template file

templates/index.html

@@ -349,6 +349,51 @@
                     downloadAnchorNode.remove();
                 };
 
+                const handleExport = () => {
+                    const dataStr = "data:text/json;charset=utf-8," + encodeURIComponent(JSON.stringify(config.value, null, 2));
+                    const downloadAnchorNode = document.createElement('a');
+                    downloadAnchorNode.setAttribute("href", dataStr);
+                    downloadAnchorNode.setAttribute("download", "config_" + new Date().toISOString() + ".json");
+                    document.body.appendChild(downloadAnchorNode);
+                    downloadAnchorNode.click();
+                    downloadAnchorNode.remove();
+                };
+
+                const handleImport = (event) => {
+                    const file = event.target.files[0];
+                    if (!file) return;
+
+                    // 1. Size Validation (< 5MB)
+                    if (file.size > 5 * 1024 * 1024) {
+                        alert('文件过大！请上传小于 5MB 的文件。');
+                        event.target.value = ''; // Reset input
+                        return;
+                    }
+
+                    const reader = new FileReader();
+                    reader.onload = (e) => {
+                        const content = e.target.result;
+
+                        // 2. Binary / Null Byte Check
+                        if (content.includes('\0')) {
+                            alert('检测到二进制内容或非法字符，请上传有效的 JSON 文件。');
+                            event.target.value = '';
+                            return;
+                        }
+
+                        try {
+                            const importedConfig = JSON.parse(content);
+                            // Merge imported config
+                            config.value = { ...config.value, ...importedConfig };
+                            alert('配置导入成功！');
+                        } catch (err) {
+                            alert('无效的 JSON 文件格式。');
+                        }
+                        event.target.value = ''; // Reset input
+                    };
+                    reader.readAsText(file);
+                };
+
                 const pollStats = () => {
                     if (pollTimer) clearTimeout(pollTimer);
                     
@@ -403,49 +448,4 @@
         }).mount('#app');
     </script>
 </body>
-</html>
-                            isRunning.value = data.running;
-
-                            // Push data to charts
-                            if (data.running) {
-                                const now = new Date().toLocaleTimeString();
-                                timeData.push(now);
-                                rpsData.push(data.rps);
-                                latencyData.push(data.avg_latency);
-                                
-                                // Keep only last 30 points
-                                if (timeData.length > 30) {
-                                    timeData.shift();
-                                    rpsData.shift();
-                                    latencyData.shift();
-                                }
-                                updateCharts();
-                            }
-
-                            if (data.running) {
-                                pollStats();
-                            }
-                        } catch (e) {
-                            console.error(e);
-                        }
-                    }, 1000);
-                };
-
-                onMounted(() => {
-                    initCharts();
-                });
-
-                return {
-                    config,
-                    stats,
-                    isRunning,
-                    errorRate,
-                    startTest,
-                    stopTest,
-                    downloadReport
-                };
-            }
-        }).mount('#app');
-    </script>
-</body>
 </html>