打开同一登录页面概率获取不到userAgent

可参考如下代码：

import web_webview from '@ohos.web.webview';
import hilog from '@ohos.hilog';

@Entry
@Component
struct WebPage {
  controller: web_webview.WebviewController = new web_webview.WebviewController();
  @State ua: string = '';

  onPageShow() {
    hilog.info(0x0000, 'test', '%{public}s', `onPageShow`);
  }

  onPageHide() {
    hilog.info(0x0000, 'test', '%{public}s', `onPageHide`);
  }

  build() {
    Column() {
      Web({ src: 'www.huawei.com', controller: this.controller })
        .userAgent(this.ua)
        .onUrlLoadIntercept((event) => {
          this.ua = this.controller.getUserAgent() + 'xxx';
          hilog.info(0x0000, 'test', '%{public}s', `onUrlLoadIntercept ${event.data} ua:${this.ua}`);
          return false;
        })
        .onPageBegin((event) => {
          hilog.info(0x0000, 'test', '%{public}s', `onPageBegin ${event.url} ua:${this.ua}`);
        })
        .onPageEnd((event) => {
          hilog.info(0x0000, 'test', '%{public}s', `onPageEnd ${event.url} ua:${this.ua}}`);
        })
    }
  }
}