Ember.js ArrayProxy unshiftObject() 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，许多网站都在使用它，包括Square、Discourse、Groupon、LinkedIn、Live Nation、Twitch和Chipotle。

unshiftObject()方法用于将对象插入数组开始位置。

语法：

unshiftObject( obj );

参数：

obj: 是要设置值的属性的对象名称。

返回值： 传递的对象的对象。

安装和运行Ember.js的步骤：

要运行下面的示例，您需要先拥有一个ember项目。要创建一个项目，您需要首先安装ember-cli。在终端中写下以下代码：

npm install ember-cli

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 server

示例1： 输入以下代码以生成此示例的路由：

ember generate route unshifObject1

app/routes/unshiftObject1.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/unshiftObject1.js

import Ember from 'ember';
import { lastIndexOf, includes, addObject, clear }
    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/unshiftObject1.hbs

{{page-title "unshiftObject"}}
<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/unshiftObject1 查看输出

Ember.js ArrayProxy unshiftObject() 方法

示例2： 输入以下代码以生成此示例的路径：

ember generate route unshiftObject2

app/routes/unshiftObject2.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/unshiftObject2.js

import Ember from 'ember';
import { pushObject, pushObjects, lastIndexOf, includes }
    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/unshiftObject2.hbs

{{page-title "unshiftObject"}}
<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}}