Ember.js Ember.NativeArray reject()方法

Ember.js 是一款开源的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，许多网站都在使用Ember.js，包括Square、Discourse、Groupon、LinkedIn、Live Nation、Twitch和Chipotle等。

reject()方法 返回一个列表，其中包含提供的函数返回false的所有枚举元素。

语法：

reject(callback, target)

参数：

callback（回调函数）： 要检查的回调函数。
target（目标对象）： 要检查其元素的对象。

返回值： 匹配的对象。

安装和运行Ember.js的步骤：

要运行以下示例，您需要事先拥有一个Ember项目。要创建一个Ember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来创建项目：

ember new <project-name> --lang en

要启动服务器，请输入：

ember serve

示例1： 输入以下代码来生成此示例的路线：

ember generate route party

app/routes/party.js

import Route from "@ember/routing/route"; 
  
export default class PartyRoute extends Route { 
    partyItems = [ 
        "Digital Camera", 
        "Jugs, cups & straws", 
        "Balloons", 
        "Scissors", 
        "Cold Drink", 
        "Table Confetti", 
        "Party Hats", 
        "Wine", 
        "Napkins", 
        "Party Plates", 
        "Speakers", 
        "Music System", 
        "Cups", 
    ]; 
    itemString; 
    itemList; 
    start; 
    end; 
    helper(itemString) { 
        this.itemList = itemString.split(","); 
        for (let i = 0; i < this.itemList.length; i++) 
            this.itemList[i] = this.itemList[i].trim(); 
        return this.itemList; 
    } 
    model() { 
        return this.partyItems; 
    } 
    setupController(controller, model) { 
        this._super(controller, model); 
        controller.set("helper", this.helper); 
        controller.set("partyItems", this.partyItems); 
        controller.set("itemString", this.itemString); 
        controller.set("itemList", this.itemList); 
        controller.set("start", this.start); 
        controller.set("end", this.end); 
    } 
}

app/controllers/party.js

import Ember from 'ember'; 
import { 
    objectsAt, removeObject, removeObjects, slice, 
    reverseObjects, setObjects, reject 
} 
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        getItems(itemString) { 
            this.itemList = this.helper(itemString); 
            for (let i = 0; i < this.itemList.length; i++) 
                this.itemList[i] = parseInt(this.itemList[i]); 
            let tempItems = this.partyItems.objectsAt(this.itemList); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + '\n'; 
            alert(str); 
        }, 
        removeItems(itemString) { 
            this.itemList = this.helper(itemString); 
            if (this.itemList.length == 1) 
                this.partyItems.removeObject(this.itemList[0]); 
            else
                this.partyItems.removeObjects(this.itemList); 
            this.set('itemString', ''); 
        }, 
        sliceItems(start, end) { 
            let tempItems = this.partyItems.slice(start, end); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + '\n'; 
            alert(str); 
        }, 
        reverseItems() { 
            this.set('partyItems', this.partyItems.reverseObjects()); 
        }, 
        replaceItems(itemString) { 
            this.partyItems.setObjects(this.helper(itemString)); 
        }, 
        findMultiwordItems() { 
            let reqItem = this.partyItems.reject((item) => 
                item.split(' ').toArray().length == 1); 
            alert(reqItem); 
        } 
    }, 
});

app/template/party.hbs

{{page-title "Party"}} 
<h3>Here is a list of items: </h3> 
<ul> 
    {{#each @model as |party|}} 
    <li>{{party}}</li> 
    {{/each}} 
</ul> 
  
<br /><br /> 
<div> 
    <label>Enter Items: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="remove-item" 
        value="Remove Items"
        {{action 'removeItems' this.itemString}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Start Index: </label> 
    {{input value=this.start}} 
</div> 
<div> 
    <label>Enter End Index: </label> 
    {{input value=this.end}} 
</div> 
<div> 
    <input type="button" id="slice" 
        value="Slice"
        {{action 'sliceItems' this.start this.end}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Indices: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="get-item" 
        value="Get Items" 
        {{action 'getItems' this.itemString}} /> 
</div> 
<br /><br /> 
<div> 
    <label>Enter Items: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="replace-item" 
        value="Replace Items" 
        {{action 'replaceItems' this.itemString}} /> 
</div> 
<br /><br /> 
<input type="button" id="reverse-items" 
    value="Reverse"
    {{action 'reverseItems' }} /> 
<br /><br /> 
<input type="button" id="find-items" 
    value="Find"
    {{action 'findMultiwordItems' }} /> 
{{outlet}}

输出： 访问 localhost:4200/party 查看输出结果：

Ember.js Ember.NativeArray reject()方法

示例2： 键入以下代码以生成此示例的路由：

ember generate route movie

app/routes/movie.js

import Route from '@ember/routing/route'; 
  
export default class MovieRoute extends Route { 
    movies = [ 
        'The Shawshank Redemption', 
        'The Godfather', 
        'The Dark Knight', 
        'Schindler\'s List', 
        'The Godfather Part II', 
        '12 Angry Men', 
        'Pulp Fiction ', 
        'Raging Bull', 
        'Parasite', 
        'Se7en', 
        '3 Idiots', 
        'Forrest Gump', 
        'The Green Mile'
    ] 
    itemString; 
    itemList; 
    helper(itemString) { 
        this.itemList = itemString.split(','); 
        for (let i = 0; i < this.itemList.length; i++) 
            this.itemList[i] = this.itemList[i].trim(); 
        return this.itemList; 
    } 
    model() { 
        return this.movies; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('helper', this.helper); 
        controller.set('movies', this.movies); 
        controller.set('itemString', this.itemString); 
        controller.set('itemList', this.itemList); 
    } 
}

app/controllers/movie.js

import Ember from "ember"; 
import { 
    objectsAt, 
    removeObject, 
    removeObjects, 
    setObjects, 
    reject, 
} from "@ember/array"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        getItems(itemString) { 
            this.itemList = this.helper(itemString); 
            for (let i = 0; i < this.itemList.length; i++) 
                this.itemList[i] = parseInt(this.itemList[i]); 
            let tempItems = this.movies.objectsAt(this.itemList); 
            let str = ""; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i] + "\n"; 
            alert(str); 
        }, 
        removeItems(itemString) { 
            this.itemList = this.helper(itemString); 
            if (this.itemList.length == 1) 
                this.movies.removeObject(this.itemList[0]); 
            else this.movies.removeObjects(this.itemList); 
            this.set("itemString", ""); 
        }, 
        replaceItems(itemString) { 
            this.movies.setObjects(this.helper(itemString)); 
        }, 
        findSingleWordItems() { 
            let reqItem = this.movies.reject( 
                (item) => item.split(" ").toArray().length > 1 
            ); 
            alert(reqItem); 
        }, 
    }, 
});

app/template/movie.hbs

{{page-title "Movie"}} 
<h3>Here is a list of Movies: </h3> 
<ul> 
    {{#each @model as |movie|}} 
    <li>{{movie}}</li> 
    {{/each}} 
</ul> 
<br/><br/> 
<div> 
    <label>Enter Movies: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="remove-item" 
           value="Remove Movie" { 
           {action 'removeItems' this.itemString}}/> 
</div> 
<br/><br/> 
<div> 
    <label>Enter Indices: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="get-item" 
           value="Get Movies" 
           {{action 'getItems' this.itemString}}/> 
</div> 
<br/><br/> 
<div> 
    <label>Enter Movies: </label> 
    {{input value=this.itemString}} 
</div> 
<div> 
    <input type="button" id="replace-item" 
           value="Replace Movies" 
           {{action 'replaceItems' this.itemString}}/> 
</div> 
<br/><br/> 
<input type="button" id="find-items" value="Find"
       {{action 'findSingleWordItems'}}/> 
{{outlet}}