TypeError：无法读取属性＆＃39; push＆＃39;在离子3中未定义

Question

我试图在成功回调后重定向到另一个页面但是我收到此错误 TypeError：无法读取属性＆＃39; push＆＃39;未定义的

 this.http.post('http://localhost:3030/users', userDetails).subscribe(function 
 successCallback(response) {
  this.navCtrl.push(HomePage);
   }, function errorCallback(response) {
      // response with status 500
  }) ;

Answer 1

像这样使用箭头功能this.http.post('http://localhost:3030/users', userDetails).subscribe(successCallback(response) => { this.navCtrl.push(HomePage); }, errorCallback(response) => { // response with status 500 }) ; -

$ ionic cordova plugin add cordova-plugin-gyroscope
$ npm install --save @ionic-native/gyroscope