feat: 添加网络判断方法

main.js

@@ -8,11 +8,18 @@
  * @Version: 1.0.0
  */
 const { app, BrowserWindow } = require('electron')
+const path = require('path')
 
 const createWindow = () => {
   const win = new BrowserWindow({
     width: 800,
-    height: 600
+    height: 600,
+    webPreferences: {
+      preload: path.join(__dirname, 'preload.js'),
+      contextIsolation: true,
+      nodeIntegration: false,
+      sandbox: false
+    }
   })
 
   win.loadFile('./dist/index.html')

preload.js

@@ -0,0 +1,67 @@
+/*
+ * @Author: 李皓 hao_li_work@163.com
+ * @Date: 2026-07-28 16:31:45
+ * @LastEditors: 李皓 hao_li_work@163.com
+ * @LastEditTime: 2026-07-28 16:44:07
+ * @FilePath: \pc\preload.js
+ * @Description: 
+ * @Version: 1.0.0
+ */
+const { contextBridge } = require('electron')
+const nodeNet = require('net')
+const dns = require('dns')
+
+/**
+ * 尝试通过 TCP 连接指定端口检测主机是否可达
+ */
+function tryConnect(host, port, timeout) {
+  return new Promise((resolve) => {
+    const socket = new nodeNet.Socket()
+    socket.setTimeout(timeout)
+    socket.on('connect', () => { socket.destroy(); resolve(true) })
+    socket.on('error', () => { socket.destroy(); resolve(false) })
+    socket.on('timeout', () => { socket.destroy(); resolve(false) })
+    socket.connect(port, host)
+  })
+}
+
+/**
+ * 网络检测对象
+ */
+const networkUtil = {
+  /**
+   * 检测目标主机网络连通性
+   * @param {string} host - 目标主机地址
+   * @param {number} timeout - 超时时间（毫秒）
+   * @returns {Promise<boolean>} - 是否可达
+   */
+  async ping(host, timeout) {
+    // 1. 先检查 DNS 能否解析
+    try {
+      await dns.promises.resolve(host)
+    } catch {
+      return false
+    }
+
+    // 2. 依次尝试常见端口（443 优先，80 兜底）
+    const ports = [443, 80]
+    for (const port of ports) {
+      const ok = await tryConnect(host, port, timeout)
+      if (ok) return true
+    }
+
+    return false
+  }
+}
+
+/**
+ * 应用传感器对象
+ */
+const appSensor = {
+  version: '1.0.0',
+  name: 'appSensor'
+}
+
+// 安全暴露 API 给渲染进程（挂载到 window.net，页面中可用 net.ping() 调用）
+contextBridge.exposeInMainWorld('net', networkUtil)
+contextBridge.exposeInMainWorld('appSensor', appSensor)