在Chrome OS上设置代理服务器并实现无缝切换

该示例代码展示了如何在Chrome OS上设置代理服务器，同时实现无缝切换。实现方式为监听网络状态变化，当网络状态变更时自动更新代理设置。

chrome.proxy.settings.set({
  value: {
    mode: "fixed_servers",
    rules: {
      singleProxy: {
        scheme: "http",
        host: "proxy.example.com",
        port: 8080
      }
    }
  },
  scope: "regular"
}, function() {
  console.log("Proxy settings updated");
});

chrome.proxy.onProxyError.addListener(function(details) {
  console.error("Proxy error:", details.error);
});

chrome.webRequest.onBeforeRequest.addListener(function(details) {
  var proxyConfig = getProxyConfig();
  if (proxyConfig) {
    return {
      proxyServer: proxyConfig
    };
  }
}, {
  urls: ["<all_urls>"]
}, ["blocking"]);

function getProxyConfig() {
  if (isNetworkOnline()) {
    return {
      scheme: "http",
      host: "proxy.example.com",
      port: 8080
    };
  } else {
    // Return null to disable the proxy
    return null;
  }
}

function isNetworkOnline() {
  var networkStatus = chrome.networking.config.NetworkStatus;
  return chrome.networking.config.getProperties(
    {type: "WiFi"}).then(function(config) {
      return (config.NetworkStatus !== networkStatus.UNKNOWN &&
              config.NetworkStatus !== networkStatus.ARCHIVED);
    });
}

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