HarmonyOS 如何获取对象的方法列表

// xxx.ets 
import web_webview from '@ohos.web.webview'; 
import business_error from '@ohos.base'; 
 
function getMethods(classInstance: ESObject): string[] { 
  return Object.getOwnPropertyNames(classInstance.prototype).filter(name => 
  typeof classInstance.prototype[name] === 'function' && name !== 'constructor'); 
} 
 
class WebObj { 
  constructor() { 
  } 
 
  webTest(): string { 
    console.log('Web test'); 
    return "Web test"; 
  } 
 
  webString(): void { 
    console.log('Web test toString'); 
  } 
} 
 
@Entry 
@Component 
struct WebComponent { 
  controller: web_webview.WebviewController = new web_webview.WebviewController() 
  @State webTestObj: WebObj = new WebObj(); 
 
  build() { 
    Column() { 
      Button('refresh') 
        .onClick(() => { 
          try { 
            this.controller.refresh(); 
          } catch (error) { 
            let e: business_error.BusinessError = error as business_error.BusinessError; 
            console.error(`ErrorCode: ${e.code},  Message: ${e.message}`); 
          } 
        }) 
      Web({ src: '', controller: this.controller }) 
        .javaScriptAccess(true) 
        .onControllerAttached(() => { 
          const methodList = getMethods(WebObj) as string[] 
          console.log(JSON.stringify(methodList)) 
          this.controller.loadUrl($rawfile("index.html")); 
          this.controller.registerJavaScriptProxy(this.webTestObj, "objTestName", methodList); 
        }) 
    } 
  } 
}