HarmonyOS webview提前创建复用

// xxx.ets 
import web_webview from '@ohos.web.webview' 
import business_error from '@ohos.base' 
 
@Entry 
@Component 
struct WebComponent { 
  controller: web_webview.WebviewController = new web_webview.WebviewController(); 
 
  build() { 
    Column() { 
      Button('prefetchPopularPage') 
        .onClick(() => { 
          try { 
            // 预加载时，需要将'https://www.example.com'替换成一个真实的网站地址。 
            this.controller.prefetchPage('https://www.example.com'); 
          } catch (error) { 
            let e:business_error.BusinessError = error as business_error.BusinessError; 
            console.error(`ErrorCode: ${e.code}, Message: ${e.message}`); 
          } 
        }) 
      // 需要将'www.example1.com'替换成一个真实的网站地址。 
      Web({ src: 'www.example1.com', controller: this.controller }) 
    } 
  } 
}