HarmonyOS WebView的js方法在什么时机注册 ？

Web({ src: $rawfile(‘test.html’), controller: this.webviewController }).onPageEnd(()=>{ 
  try { 
    this.webviewController.registerJavaScriptProxy(this.testObj, “testObjName”, [“test”, “toString”]); 
  } catch (error) { 
    let e: business_error.BusinessError = error as business_error.BusinessError; 
    console.error(ErrorCode: ${e.code}, Message: ${e.message}); 
  } 
})