Ember.js Ember.NativeArray map() 方法

Ember.js Ember.NativeArray map() 方法

Ember.js 是一个基于模型-视图-控制器(MVC)架构的开源JavaScript框架,用于开发大型客户端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。

map() 方法用于将数组中的所有项映射为特定函数。

语法:

map(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: 映射后的数组。

安装和运行Ember.js的步骤:

步骤1: 要运行以下示例,您需要先准备一个Ember项目。为了创建一个,您需要先安装ember-cli。在终端中写入以下代码:

npm install ember-cli

步骤2: 现在您可以通过键入以下代码来创建项目:

ember new <project-name> --lang en

启动服务器的方法:

ember serve

示例1: 输入以下代码以生成此示例的路由:

ember generate route details

app/routes/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); 
   } 
}

app/controllers/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(); 
       }, 
   }, 
});

app/template/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

Ember.js Ember.NativeArray map() 方法

示例2: 在本示例中,输入以下代码以生成路由:

ember generate route students

app/routes/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); 
   } 
}

app/controllers/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) 
           ); 
       }, 
   }, 
});

app/template/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以查看输出

Ember.js Ember.NativeArray map() 方法

参考: https://api.emberjs.com/ember/4.6/classes/Ember.NativeArray/methods?anchor=map

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