小编jsa*_*ter的帖子

我是javascript和AngularJS的新手,想知道为什么引号内的表达式没有被评估？

<span ng-show="{{remaining()}}!==0">sometext</span>

它只是这样打印:

<span ng-show="2!==0">sometext</span>

无论内容如何,​​ng-show都不起作用.即使表达式包含在eval中,也会显示文本(和打印的表达式):

eval("{{remaining()}}!==0")

为了这个,我在控制器中创建了一个函数:

<span ng-show="renderOrNot()">sometext</span>

这是有效的,但我希望每次想要进行比较时都不必编写函数

我正在使用@ angular/material 2.0.0-alpha.11-3 angular-cli 1.0.0-beta.19-3 karma 1.2.0 karma-jasmine 1.0.2开发Angular2应用程序

运行它工作正常,但模板有md-icon按钮的几个测试失败,模板错误:

ERROR: 'Unhandled Promise rejection:', 'Template parse errors:
'md-icon' is not a known element:
1. If 'md-icon' is an Angular component, then verify that it is part of this module.                                
2. If 'md-icon' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA" to the '@NgModule.schemas' of this component to suppress this message

我的app.module.ts:

import { MaterialModule } from '@angular/material';

@NgModule({
  declarations: [
    AppComponent,
    LinearProgressIndicatorComponent,
    MyNewDirectiveDirective,
    MyNewServiceDirective,
    HeaderComponent,
    MenuComponent,
    WatchpanelComponent,
    InputComponent
  ],
  imports: [ …

我正在开发一个运行良好的应用程序,但Jasmine测试会抛出模板错误.由于运行应用程序有效,模板引用变量可以绑定到ngModel,但为什么在运行测试时它不起作用？我正在使用"@ angular/forms":"~2.2.3",

ERROR: 'Unhandled Promise rejection:', 'Template parse errors:
There is no directive with "exportAs" set to "ngModel" ("d="name" required pattern="^[a-zA-Z]+[\s\S]*" 
                [(ngModel)]="model.name" name="name" [ERROR ->]#name="ngModel" >                                    
              </div>                                                                                                
              <div [hidden]="name.valid || name.pristine"  

我的app.module.ts:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';

import { AppComponent } from './app.component';
import { LinearProgressIndicatorComponent } from './linear-progress-indicator/linear-progress-indicator.component';
import { MyNewDirectiveDirective } from './directives/my-new-directive.directive';
import { MyNewServiceDirective } from './services/my-new-service.directive'; …