在无网环境中调用同步方法请求时，无法解析nethandle对应的内容，方法执行时会报错。可以使用try-catch语句捕获并处理报错信息。参考代码如下：
import { connection } from '@kit.NetworkKit'
import { BusinessError } from '@kit.BasicServicesKit';
@Entry
@Component
struct GetErrInfo {
getErrInfo() {
try {
let netHandle = connection.getDefaultNetSync();
let connectionproperties = connection.getConnectionPropertiesSync(netHandle);
} catch (err) {
let error: BusinessError = err as BusinessError;
console.log('error: ' + JSON.stringify(error));
}
}
build() {
Row() {
Column() {
Button('获取网络类型')
.onClick(() => {
this.getErrInfo();
})
}
.width('100%')
}
.height('100%')
}
}