Ember.js Ember.NativeArray reverseObjects() 方法

Ember.js 是一个开源的JavaScript框架，用于开发基于Model-View-Controller（MVC）架构的大型客户端Web应用程序。Ember.js 是最常用的前端应用程序框架之一。它被设计用于加快开发速度和提高生产力。目前，许多网站都在使用它，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

reverseObjects() 方法用于反转数组中的对象。

语法：

reverseObjects( );

参数： 它不接受任何参数。

返回值： EmberArray 接收器。

安装和运行 Ember.js 的步骤：

要运行以下示例，您需要拥有一个 ember 项目。要创建一个项目，您需要首先安装 ember-cli。在终端中输入以下代码：

npm install ember-cli

现在你可以通过输入以下代码片段创建项目：

ember new <project-name> --lang en

启动服务器的方法是：输入以下命令：

ember serve

示例1： 输入以下代码以生成此示例的路线：

ember generate route reverseObject1

app/routes/reverseObject1.js

import Route from '@ember/routing/route'; 
  
export default class ListRoute extends Route { 
    list = [ 
    "Digital Camera", 
    "Speakers", 
    "Balloons", 
    "Scissors", 
    "Cups", 
    "Table Confetti", 
    "Scissors", 
    "Wine", 
    "Napkins", 
    "Party Plates", 
    "Speakers", 
    "Music System", 
    "Cups",]; 
    item; 
    idx; 
    model() { 
        return this.list; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('list', this.list); 
        controller.set('item', this.item); 
        controller.set('idx', this.idx); 
    } 
}

app/controllers/reverseObject1.js

import Ember from 'ember'; 
import { reverseObjects, uniq, setObjects, unshiftObject } 
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        reverse() { 
            this.list.setObjects(this.list.reverseObjects()); 
        }, 
        remove_d() { 
            let k = this.list.uniq();     
            this.list.setObjects(k); 
        },     
        add_first(item) { 
            this.list.unshiftObject(item); 
        }, 
    }, 
});

app/templates/reverseObject1.hbs

{{page-title "reverseObject"}} 
<h3>Here is a list of Items: </h3> 
<ul> 
    {{#each @model as |i|}} 
        <li>{{i}}</li> 
    {{/each}} 
</ul> 
  
<br /> 
<div> 
    <label>Enter Item: </label> 
    {{input value=this.item}} 
</div> 
<div> 
    <input 
        type="button"
        id="insert-item"
        value="Insert at Begining"
        {{action "add_first" this.item }} 
    /> 
</div> 
<br /> 
<input type="button"
    id="remove-duplicates"
    value="Remove duplicates"
    {{action "remove_d"}} /> 
  
<br /><br/> 
<input type="button"
    id="reverse_list"
    value="Reverse List"
    {{action "reverse"}} /> 
{{outlet}}

输出： 访问 localhost:4200/reverseObject1 查看输出

Ember.js Ember.NativeArray reverseObjects() 方法

示例2： 输入以下代码以生成该示例的路由代码：

ember generate route reverseObject2

app/routes/reverseObject2.js

import Route from '@ember/routing/route'; 
  
export default class PartyRoute extends Route { 
    partyItems = [ 
        'Oxygen', 
        'Tenet', 
        'Source Code', 
        'Infine', 
        'Loopert', 
        'Tenet', 
        'SpiderHead', 
        'The Thing', 
        'A Quiet Place', 
        'The Invisible Man', 
        'Looper', 
        'The Thing', 
        'Ad Astra'
    ]; 
  temp = [ 
        'Shutter Island', 
        'Matrix', 
        'Avatar', 
        'Fantastic Beast', 
        'Avengers', 
        'Fantastic four', 
        'HulK', 
        'Superman', 
        'Spiderman', 
        'The Batman'
    ]; 
    item; 
    idx; 
    model() { 
        return this.partyItems; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('partyItems', this.partyItems); 
        controller.set('item', this.item); 
        controller.set('idx', this.idx); 
    controller.set('temp', this.temp); 
    } 
}

app/controllers/reverseObject2.js

import Ember from 'ember'; 
import { reverseObjects, unshiftObject, uniq, } 
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        invert() { 
            this.partyItems.reverseObjects( ); 
              
        }, 
        insert_first(data) { 
            this.partyItems.unshiftObject(data); 
        }, 
        remove_d() { 
            let res = this.partyItems.uniq(); 
            this.partyItems.setObjects(res) 
        }, 
    }, 
});

app/templates/reverseObject2.hbs

{{page-title "reverseObject"}} 
<h3>Here is a list of items: </h3> 
<ul> 
    {{#each @model as |party|}} 
        <li>{{party}}</li> 
    {{/each}} 
</ul> 
<br /><br /> 
<div> 
    <label>Enter Item: </label> 
    {{input value=this.item}} 
</div> 
<div> 
    <input 
        type="button"
        id="insert-begining"
        value="Insert at Begining"
        {{action "insert_first" this.item }} 
    /> 
</div> 
<br /> 
  
<input type="button"
    id="reverse_list"
    value="Reverse List"
    {{action "invert"}} /> 
<br /><br/> 
<input type="button"
    id="remove-duplicates"
    value="Remove duplicates"
    {{action "remove_d"}} /> 
{{outlet}}