feat: 添加后台主页实现

server/api/system/performance.ts

@@ -0,0 +1,70 @@
+import os from 'os';
+
+export default defineEventHandler(async (event) => {
+  try {
+    // 获取CPU信息
+    const cpuUsage = getCpuUsage();
+    
+    // 获取内存信息
+    const totalMemory = os.totalmem();
+    const freeMemory = os.freemem();
+    const memoryUsage = {
+      total: formatBytes(totalMemory),
+      free: formatBytes(freeMemory),
+      used: formatBytes(totalMemory - freeMemory),
+      percent: Math.round(((totalMemory - freeMemory) / totalMemory) * 100)
+    };
+    
+    return {
+      success: true,
+      data: {
+        cpu: {
+          usage: cpuUsage
+        },
+        memory: memoryUsage
+      }
+    };
+  } catch (error) {
+    console.error('Error fetching performance info:', error);
+    return {
+      success: false,
+      message: '获取性能数据失败'
+    };
+  }
+});
+
+// 格式化字节数为可读格式
+function formatBytes(bytes: number) {
+  if (bytes === 0) return '0 Bytes';
+  
+  const k = 1024;
+  const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  
+  return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
+}
+
+// 获取CPU使用率
+function getCpuUsage() {
+  try {
+    const cpus = os.cpus();
+    let totalIdle = 0;
+    let totalTick = 0;
+    
+    cpus.forEach(cpu => {
+      for (const type in cpu.times) {
+        totalTick += cpu.times[type as keyof typeof cpu.times];
+      }
+      totalIdle += cpu.times.idle;
+    });
+    
+    const idle = totalIdle / cpus.length;
+    const total = totalTick / cpus.length;
+    const usagePercent = Math.round(100 - (idle / total * 100));
+    
+    return usagePercent;
+  } catch (error) {
+    console.error('Error calculating CPU usage:', error);
+    return 0;
+  }
+}