EXCEPTION: TypeError: undefined is not an object (evaluating 'pipe.constructor') in Ionic 2?

Question

我的 Ionic 2 应用程序在 chrome 浏览器上运行良好，它提供了预期的输出。但是当它运行在模拟器或浏览器上给出以下错误时。

这是我使用的代码：

<label class="time">{{appointment.DateSent | date:"HH"}}:{{ appointment.DateSent| date:"mm"}}</label>
<label class="month">{{appointment.DateSent| date:"MMM"}}</label>
<label class="day">{{appointment.DateSent| date:"dd"}}</label>
<label class="year">{{appointment.DateSent| date:"yyyy"}}</label>

Class 实施：

    import {Page, NavController, NavParams} from 'ionic/ionic';
    import { Component, Pipe, PipeTransform, Inject, OnInit} from 'angular2/core';
    import 'rxjs/add/operator/map';
    import { Http, Headers, URLSearchParams } from 'angular2/http';
    import {SERVER_URL, appName, alertAppName} from '../services/config';
    import {AppointmentsDetailPage} from '../appointments-detail/appointments-detail';
    import {MessagesService} from '../services/messages-service';

    var today = new Date();

    @Page({
      templateUrl: 'build/pages/appointments/appointments.html',
      providers: [MessagesService]
    })
    export class AppointmentsPage implements PipeTransform {
      constructor(http: Http, nav: NavController, messagesService:MessagesService, navParams:NavParams) {
            this.http = http;
            this.messagesService = messagesService;
            this.nav = nav;

            this.selectedItem = navParams.get('item');
      }

ngOnInit() {
        this.messagesService.getAppointmentList()
        .subscribe(data => {

          var appointments = new Array();
              for(var i in data){
                var key = data[i];

                appointments.push({
                  MessageID: key.MessageID,
                  CategoryID: key.CategoryID,
                  DateSent: new Date(key.DateSent),
                  Title: key.Title,
                  MessageContent: key.MessageContent,
                  Sender: key.Sender,
                  Recipient: key.Recipient,
                  DateReceived: key.DateReceived,
                  DateRead: key.DateRead,
                  Note_Direction: key.Note_Direction,
                  Viewed: key.Viewed,
                  AppointmentDateTime: key.AppointmentDateTime,
                  MessageAttachments: key.MessageAttachments
                });
              }


      this.appointments = appointments;

所有日期管道在 Chrome 浏览器中工作正常，没有错误，但在模拟器或设备上出现以下异常（来自 Safari 模拟器调试）

已编辑：

Index.html

<!DOCTYPE html>
<html dir="ltr" lang="en">

<head>
  <title>Ionic</title>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">

  <!--<meta http-equiv="Content-Security-Policy" content="img-src 'self' data:; default-src 'self' http://XX.XX.XX.XX:8084/mypp/">-->
  <!--<meta http-equiv="Content-Security-Policy" content="default-src *; script-src 'self' 'unsafe-inline' 'unsafe-eval' *; style-src  'self' 'unsafe-inline' *">-->
  <meta name="format-detection" content="telephone=no">
  <meta name="msapplication-tap-highlight" content="no">

  <link rel="stylesheet" href="build/css/font-awesome.min.css">
  <link ios-href="build/css/app.ios.css" rel="stylesheet">
  <link md-href="build/css/app.md.css" rel="stylesheet">



</head>

<body>
  <ion-app></ion-app>

  <script src="node_modules/es6-shim/es6-shim.min.js"></script>
  <script src="node_modules/systemjs/dist/system-polyfills.js"></script>
  <script src="lib/ngCordova/dist/ng-cordova.js"></script>
  <script src="cordova.js"></script>
  <script src="build/js/app.bundle.js"></script>
</body>

</html>

Answer 1

您应该加载 polyfill（Chrome 可以运行 Angular 没有它们）：

<script src="node_modules/es6-shim/es6-shim.min.js"></script>
<script src="node_modules/systemjs/dist/system-polyfills.js"></script>

Answer 2

Sasxa 的回答帮我解决了这个问题。虽然我试图指定路径，但它似乎没有找到它的资源。以下资源帮助我得到了答案。正如 Sasxa 指出的那样，Safari 需要 Intl polyfill。

我尝试使用 NPM 和 Bower 安装它但没有用，最后我决定使用 CDN 位置，因为它对我有用。

<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=Intl.~locale.en"></script>

EXCEPTION: TypeError: undefined is not an object (evaluating 'pipe.constructor') in Ionic 2?

EXCEPTION: TypeError: undefined is not an object (evaluating 'pipe.constructor') in Ionic 2?

javascript

remote-debugging

pipe

ionic2

angular