Ember.js EmberArray forEach() 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。它旨在加速开发并提高生产效率。目前，它被许多网站使用，包括Square、Discourse、Groupon、Linked In、Live Nation、Twitch和Chipotle。

forEach() 方法 用于对数组进行迭代，并为列表中的每个项调用回调函数。

语法：

forEach( callback, target );

属性：

callback（回调函数）： 每个项调用的函数。
target（目标）： 函数所针对的项。

返回值： 返回接收器对象。

安装步骤：

步骤1： 要运行下面的示例，您需要拥有一个 Ember 项目。为了创建一个项目，您需要先安装 ember-cli。在终端中输入以下代码：

npm install ember-cli

步骤2： 现在您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 forEach1

app/routes/forEach1.js

import Route from '@ember/routing/route'; 
import { } from '@ember/array'; 
  
export default class FruitsRoute extends Route { 
    fruits = [ 
        { 
            'name': 'Lady Finger', 
            'isFruit': false, 
            'color': 'green', 
            'Bucket': 1, 
        }, 
        { 
            'name': 'Brinjal', 
            'isFruit': false, 
            'color': 'purple', 
            'Bucket': 1, 
        }, 
        { 
            'name': 'Apple', 
            'isFruit': true, 
            'color': 'red', 
            'Bucket': 2, 
        }, 
        { 
            'name': 'Grapes', 
            'isFruit': true, 
            'color': 'green', 
            'Bucket': 2, 
        }, 
        { 
            'name': 'Mango', 
            'isFruit': true, 
            'color': 'yellow', 
            'Bucket': 2, 
        }, 
        { 
            'name': 'Watermelon', 
            'isFruit': true, 
            'color': 'red', 
            'Bucket': 2, 
        }, 
        { 
            'name': 'Orange', 
            'isFruit': true, 
            'color': 'orange', 
            'Bucket': 2, 
        } 
    ]; 
    model() { 
        return this.fruits; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('fruits', this.fruits); 
    } 
}

app/controllers/forEach1.js

import Ember from "ember"; 
import { shiftObject, isAny, isEvery } from "@ember/array"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        Bucket1() { 
            let ans = ''; 
            this.fruits.forEach((item) => 
                ans += (item.Bucket == 1) ? 
                    (item.name + '\n') : ''); 
            alert(ans); 
        }, 
        allFruit() { 
            let ans = ''; 
            this.fruits.forEach((item) => 
                ans += (item.isFruit) ? 
                    (item.name + '\n') : ''); 
            alert(ans); 
        }, 
    } 
});

app/templates/forEach1.hbs

{{page-title "Fruits"}} 
<h3>Here is a list of eatables: </h3> 
<ul> 
    {{#each @model as |eatable|}} 
    <li> 
        {{eatable.name}} 
    </li> 
    {{/each}} 
</ul> 
<br /><br /> 
<input type="button" id="fruit-any" 
    value="Item in Bucket 1" 
    {{action "Bucket1" }} /> 
<br /><br /> 
<input type="button" id="fruit-all" 
    value="All Fruits" 
    {{action "allFruit" }} /> 
{{outlet}}

输出： 访问 localhost:4200/forEach1 查看输出

Ember.js EmberArray forEach() 方法

示例2

输入以下代码以生成此示例的路由：

ember generate route forEach2

app/routes/forEach2.js

import Route from '@ember/routing/route'; 
  
export default class DetailsRoute extends Route { 
    details = [ 
        { 
            name: 'Anubhav', 
            mobile: '1298119967', 
            city: 'Patna', 
            country: 'India', 
            gender: 'M', 
            zipCode: '800020', 
        }, 
        { 
            name: 'Sakshi', 
            mobile: '1234567890', 
            city: 'Mumbai', 
            country: 'India', 
            gender: 'F', 
            zipCode: '400001', 
        }, 
        { 
            name: 'Satyam', 
            mobile: '2222222222', 
            city: 'Delhi', 
            country: 'India', 
            gender: 'M', 
            zipCode: '110012', 
        }, 
        { 
            name: 'Shivam', 
            mobile: '1122113322', 
            city: 'Bangalore', 
            country: 'India', 
            gender: 'M', 
            zipCode: '530068', 
        }, 
        { 
            name: 'Ayushi', 
            mobile: '2244668800', 
            city: 'Jaipur', 
            country: 'India', 
            gender: 'F', 
            zipCode: '302001', 
        }, 
    ]; 
    city; 
    code; 
    model() { 
        return this.details; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('details', this.details); 
        controller.set('city', this.city); 
        controller.set('code', this.code); 
    } 
}

app/controllers/forEach2.js

import Ember from "ember"; 
import { shiftObject, isAny, isEvery } from "@ember/array"; 
  
export default Ember.Controller.extend({ 
    actions: { 
        Bucket1() { 
            let ans = ''; 
            this.fruits.forEach((item) => 
                ans += (item.Bucket == 1) ? 
                    (item.name + '\n') : ''); 
            alert(ans); 
        }, 
        allFruit() { 
            let ans = ''; 
            this.fruits.forEach((item) => 
                ans += (item.isFruit) ? 
                    (item.name + '\n') : ''); 
            alert(ans); 
        }, 
    } 
});

app/templates/forEach2.hbs

{{page-title "Fruits"}} 
<h3>Here is a list of eatables: </h3> 
<ul> 
    {{#each @model as |eatable|}} 
    <li> 
        {{eatable.name}} 
    </li> 
    {{/each}} 
</ul> 
<br /><br /> 
<input type="button" id="fruit-any" 
    value="Item in Bucket 1" 
    {{action "Bucket1" }} /> 
<br /><br /> 
<input type="button" id="fruit-all" 
    value="All Fruits" 
    {{action "allFruit" }} /> 
{{outlet}}

输出： 访问 localhost:4200/forEach2 查看结果

Ember.js EmberArray forEach() 方法