HarmonyOS 使用webview嵌套网页，真机运行白屏

可以尝试下面的代码：

Web({ src:'', controller: this.controller })
  .onControllerAttached(()=>{
    this.controller.setCustomUserAgent('Mozilla/5.0 (Linux; Android 9; VRD-AL10; HMSCore 6.3.0.331) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.88 HuaweiBrowser/12.0.4.1 Mobile Safari/537.36')
    this.controller.loadUrl('https://xxx')
  })
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