Ember.js Ember.NativeArray popObject()方法

Ember.js是一个开源的JavaScript框架，用于开发基于模型-视图-控制器（MVC）架构的大型客户端Web应用程序。Ember.js是最广泛使用的前端应用程序框架之一。它旨在加快开发速度并提高生产力。目前，它被许多网站使用，包括Square、Discourse、Groupon、Linked In、Live Nation、Twitch和Chipotle。

popObject()方法用于从数组中弹出对象。

语法:

popObject()

返回值: 弹出的对象

安装和运行Ember.js的步骤：

步骤1： 要运行下面的示例，您需要有一个Ember项目。要创建一个项目，首先需要安装ember-cli。在终端中编写下面的代码：

npm install ember-cli

步骤2： 现在你可以通过输入以下代码来创建项目：

ember new <project-name> --lang en

要启动服务器，请键入：

ember serve

示例1： 输入以下代码以生成此示例的路线：

ember generate route notepad

app/routes/notepad.js

import Route from '@ember/routing/route';
 
export default class NotepadRoute extends Route {
    items = ['Bread', 'Facewash', 'Egg', 'Pen', 'Medicine'];
    model() {
        return this.items;
    }
    setupController(controller, model) {
        this._super(controller, model);
        controller.set('items', this.items);
    }
}

app/controllers/notepad.js

import Ember from 'ember';
import { popObject } from '@ember/array';
 
export default Ember.Controller.extend({
    actions: {
        removeItem() {
            if (this.items.length == 0)
                alert('Item List is Empty');
            this.items.popObject();
        }
    }
})

app/template/notepad.hbs

{{page-title "Notepad"}}
<h2>Your Items</h2>
<ul>
    {{#each @model as |i|}}
        <li>{{i}}</li>
      {{/each}}
</ul>
<br /><br />
<div>
    <input
        type="button"
        id="remove-item"
        value="Remove Item"
        {{action "removeItem"}}
      />
</div>
{{outlet}}

输出： 访问localhost:4200/notepad查看输出

Ember.js Ember.NativeArray popObject()方法

示例2： 输入以下代码生成此示例的路线：

ember generate route richest-people

app/routes/richest-people.js

import Route from '@ember/routing/route';
import { classify, w } from '@ember/string';
 
export default class RichestPeopleRoute extends Route {
    richestPeople = ['elon Musk', 'bernard Arnault and family',
        'jeff Bezos', 'Bill gates', 'gautam adani and family',
        'Larry Page', 'Warren Buffet', 'larry Ellison',
        'mukesh ambani', 'sergey brin'];
    num = 10;
    init() {
        this.richestPeople = this.richestPeople.map(classify);
    }
    model() {
        this.init();
        return this.richestPeople;
    }
    setupController(controller, model) {
        this._super(controller, model);
        controller.set('num', this.num);
        controller.set('richestPeople', this.richestPeople)
    }
}

app/controllers/richest-people.js

import Ember from 'ember';
import { popObject } from '@ember/array';
 
export default Ember.Controller.extend({
   actions: {
       set(n) {
           this.num = parseInt(n);
           while (this.richestPeople.length > this.num) {
               this.richestPeople.popObject();
           }
       }
   }
})

app/template/richest-people.hbs

{{page-title "Richest People"}}
<div>
    <label>Enter Value: </label>
      {{input value=this.num}}
</div>
<div>
    <input type="button" id="fetch"   
        value="Fetch" {{action "set" this.num}} />
</div>
<br /><br />
<h2>Top {{this.num}} Richest People in the World</h2>
<ul>
    {{#each @model as |rich-person|}}
        <li>{{rich-person}}</li>
      {{/each}}
</ul>
{{outlet}}

输出: 访问 localhost:4200/richest-people 查看输出

Ember.js Ember.NativeArray popObject()方法