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。但是当它在模拟器或浏览器上运行时出现以下错误。
这是我正在使用的代码:
<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>
类实现:
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 浏览器中都工作正常，没有错误，但在模拟器或设备上出现以下异常(取自 Safari 模拟器调试)
已编辑:
索引.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>
最佳答案
您应该加载 polyfill(Chrome 可以在没有它们的情况下运行 Angular):
<script src="node_modules/es6-shim/es6-shim.min.js"></script>
<script src="node_modules/systemjs/dist/system-polyfills.js"></script>
关于javascript - 异常 : TypeError: undefined is not an object (evaluating 'pipe.constructor' ) in Ionic 2?，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35742679/