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Embeer.js MutableArray forEach()用法及代码示例


Ember.js 是一个开源 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是使用最广泛的前端应用框架之一。它的目的是加速开发并提高生产力。目前，它被大量网站使用，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

forEach() 方法用于对数组的每个项目运行函数。

用法:

forEach(callback, target)

参数：

  • callback:要执行的回调函数。
  • target:要使用的目标对象。

返回值：收件人。

安装和运行 Ember.js 的步骤：

第 1 步：要运行以下示例，您需要有一个 ember 项目。要创建一个，您需要先安装ember-cli。在终端中写入以下代码：

npm install ember-cli

第 2 步：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：键入以下代码以生成本示例的路由：

ember generate route details

应用程序/路线/details.js


import Route from '@ember/routing/route'; 
  
export default class DetailsRoute extends Route { 
    details = [ 
        { 
            name: 'Anubhav', 
            mobile: '1298119967', 
            age: 20, 
            salary: 10000, 
            city: 'Patna', 
            country: 'India', 
            gender: 'M', 
            zipCode: '800020', 
        }, 
        { 
            name: 'Sakshi', 
            mobile: '1234567890', 
            age: 17, 
            salary: 2000, 
            city: 'Mumbai', 
            country: 'India', 
            gender: 'F', 
            zipCode: '400001', 
        }, 
        { 
            name: 'Satyam', 
            mobile: '2222222222', 
            age: 42, 
            salary: 230000, 
            city: 'Delhi', 
            country: 'India', 
            gender: 'M', 
            zipCode: '110012', 
        }, 
        { 
            name: 'Shivam', 
            mobile: '1122113322', 
            age: 33, 
            salary: 122200, 
            city: 'Patna', 
            country: 'India', 
            gender: 'M', 
            zipCode: '530068', 
        }, 
        { 
            name: 'Ayushi', 
            mobile: '2244668800', 
            age: 11, 
            salary: 100, 
            city: 'Jaipur', 
            country: 'India', 
            gender: 'F', 
            zipCode: '302001', 
        }, 
        { 
            name: 'Yeshwant', 
            mobile: '1133557799', 
            age: 19, 
            salary: 5000, 
            city: 'Chennai', 
            country: 'India', 
            gender: 'M', 
            zipCode: '600001', 
        }, 
        { 
            name: 'Siddhant', 
            mobile: '9911000000', 
            age: 65, 
            salary: 992130, 
            city: 'Mangalore', 
            country: 'India', 
            gender: 'M', 
            zipCode: '574142', 
        }, 
        { 
            name: 'Khushi', 
            mobile: '8888888888', 
            age: 10, 
            salary: 0, 
            city: 'Pune', 
            country: 'India', 
            gender: 'F', 
            zipCode: '111045', 
        }, 
    ]; 
    model() { 
        return this.details; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('details', this.details); 
    } 
}

应用程序/控制器/details.js


import Ember from 'ember'; 
import { any, slice, reverseObjects, rejectBy }  
    from '@ember/array'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        getAllNames() { 
            let tempItems = this.details.getEach('name'); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++)  
                str += tempItems[i] + '\n'; 
            alert(str); 
        }, 
        allAdult() { 
            let res = this.details.every((person) => 
                person.age > 18); 
            alert(`${res ? 'YES' : 'NO'}`); 
        }, 
        getFemale() { 
            let tempItems = this.details.filter((person) =>  
                person.gender === 'F'); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i].name + '\n'; 
            alert(str); 
        }, 
        increaseSalary() { 
            this.details.forEach((person) => 
                Ember.set(person, 'salary', 
                    person.salary + 1000) 
            ); 
        }, 
        hideNumber() { 
            this.details.map((person) => Ember.set 
            (person, 'mobile', '**********')); 
        }, 
        clearAll() { 
            this.details.clear(); 
        }, 
    }, 
});

应用程序/模板/details.hbs


{{page-title "Details"}} 
<h3>List of People: </h3> 
<br /><br /> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Gender</th> 
        <th>Age</th> 
        <th>Salary</th> 
        <th>Mobile</th> 
        <th>City</th> 
        <th>Country</th> 
        <th>Zip Code</th> 
      </tr> 
      {{#each @model as |detail|}} 
    <tr> 
          <td>{{detail.name}}</td> 
         <td>{{detail.gender}}</td> 
          <td>{{detail.age}}</td> 
          <td>{{detail.salary}}</td> 
          <td>{{detail.mobile}}</td> 
          <td>{{detail.city}}</td> 
          <td>{{detail.country}}</td> 
          <td>{{detail.zipCode}}</td> 
    </tr> 
      {{/each}} 
</table> 
<br /><br /> 
<input
    type="button"
      id="get-all"
      value="Get All Names"
      {{action "getAllNames"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="get-all-adult"
      value="Is there only adult?"
      {{action "allAdult"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="get-female"
      value="Get Female"
      {{action "getFemale"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="increase-salary"
      value="Increase Salary"
      {{action "increaseSalary"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="hide-number"
      value="Hide Number"
      {{action "hideNumber"}} 
/> 
<br /><br /> 
<input type="button"
    id="clear-all" 
    value="Clear" 
    {{action "clearAll"}} 
/>

输出：访问 localhost:4200/details 查看输出

示例 2：键入以下代码以生成本示例的路由：

ember generate route students

应用程序/路线/students.js


import Route from '@ember/routing/route'; 
  
export default class StudentsRoute extends Route { 
    students = [ 
        { 
            name: 'Alix Mainston', 
            gender: 'F', 
            class: 9, 
            grade: 'B', 
            pocket_money: 9643, 
        }, 
        { 
            name: 'Mufinella Lezemore', 
            gender: 'F', 
            class: 10, 
            grade: 'A', 
            pocket_money: 6960, 
        }, 
        { 
            name: 'Sibylla Hanbridge', 
            gender: 'F', 
            class: 8, 
            grade: 'D', 
            pocket_money: 2272, 
        }, 
        { 
            name: 'Wilow Lingwood', 
            gender: 'F', 
            class: 8, 
            grade: 'A', 
            pocket_money: 4279, 
        }, 
        { 
            name: 'Estele MacIllrick', 
            gender: 'M', 
            class: 9, 
            grade: 'E', 
            pocket_money: 2579, 
        }, 
        { 
            name: 'Israel Blackaller', 
            gender: 'M', 
            class: 10, 
            grade: 'A', 
            pocket_money: 9381, 
        }, 
        { 
            name: 'Doralyn Sowerbutts', 
            gender: 'F', 
            class: 12, 
            grade: 'A', 
            pocket_money: 4933, 
        }, 
        { 
            name: 'Lolly Boynes', 
            gender: 'F', 
            class: 8, 
            grade: 'A', 
            pocket_money: 1988, 
        }, 
        { 
            name: 'Lucie Janowski', 
            gender: 'F', 
            class: 11, 
            grade: 'F', 
            pocket_money: 6185, 
        }, 
        { 
            name: 'Camilla Ritelli', 
            gender: 'Bigender', 
            class: 9, 
            grade: 'C', 
            pocket_money: 1105, 
        }, 
        { 
            name: 'Celene Enticknap', 
            gender: 'F', 
            class: 9, 
            grade: 'A', 
            pocket_money: 7186, 
        }, 
        { 
            name: 'Hillier Buchanan', 
            gender: 'M', 
            class: 12, 
            grade: 'A', 
            pocket_money: 844, 
        }, 
        { 
            name: 'Afton Povey', 
            gender: 'F', 
            class: 9, 
            grade: 'F', 
            pocket_money: 6633, 
        }, 
        { 
            name: 'Flint Chesley', 
            gender: 'M', 
            class: 9, 
            grade: 'B', 
            pocket_money: 3835, 
        }, 
        { 
            name: 'Sigfrid Copper', 
            gender: 'M', 
            class: 8, 
            grade: 'D', 
            pocket_money: 3883, 
        }, 
        { 
            name: 'Barry Donnelly', 
            gender: 'M', 
            class: 12, 
            grade: 'C', 
            pocket_money: 4521, 
        }, 
        { 
            name: 'Buck Polgreen', 
            gender: 'M', 
            class: 8, 
            grade: 'C', 
            pocket_money: 553, 
        }, 
    ]; 
    model() { 
        return this.students; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('students', this.students); 
    } 
}

应用程序/控制器/students.js


import Ember from 'ember'; 
  
export default Ember.Controller.extend({ 
    actions: { 
        getAllNames() { 
            let tempItems = this.students.getEach('name'); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++)  
                str += tempItems[i] + '\n'; 
            alert(str); 
        }, 
        allPass() { 
            let res = this.students.every((student) 
                => student.grade != 'F'); 
            alert(`${res ? 'YES' : 'NO'}`); 
        }, 
        getFemale() { 
            let tempItems = this.students.filter((student) 
                => student.gender === 'F'); 
            let str = ''; 
            for (let i = 0; i < tempItems.length; i++) 
                str += tempItems[i].name + '\n'; 
            alert(str); 
        }, 
        changeGrade() { 
            this.students.forEach((student) => 
                Ember.set(student, 'grade', 'A') 
            ); 
        }, 
        increasePocketMoney() { 
            this.students.map((student) => 
                Ember.set(student, 'pocket_money',  
                student.pocket_money + 1000) 
            ); 
        }, 
    }, 
});

应用程序/模板/students.hbs


{{page-title "Students"}} 
<h3>List of Students: </h3> 
<br /><br /> 
<table> 
    <tr> 
        <th>Name</th> 
        <th>Class</th> 
        <th>Gender</th> 
        <th>Grade</th> 
        <th>Pocket Money</th> 
      </tr> 
          {{#each @model as |student|}} 
    <tr> 
        <td>{{student.name}}</td> 
          <td>{{student.class}}</td> 
          <td>{{student.gender}}</td> 
          <td>{{student.grade}}</td> 
          <td>{{student.pocket_money}}</td> 
    </tr> 
      {{/each}} 
</table> 
<br /><br /> 
<input
    type="button"
      id="get-all"
      value="Get All Names"
      {{action "getAllNames"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="all-pass"
      value="Did Everyone Pass?"
      {{action "allPass"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="get-female"
      value="Get Female"
      {{action "getFemale"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="increase-pocket-money"
      value="Increase Pocket Money"
      {{action "increasePocketMoney"}} 
/> 
<br /><br /> 
<input
    type="button"
      id="change-grade"
      value="Change Grade"
      {{action "changeGrade"}} 
/> 
{{outlet}}

输出：访问 localhost:4200/students 查看输出

参考： https://api.emberjs.com/ember/4.4/classes/MutableArray/methods



相关用法


注：本文由纯净天空筛选整理自aayushmohansinha大神的英文原创作品 Ember.js MutableArray forEach() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。