Embeer.js MutableArray map()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。

map() 方法用于将数组中的所有项目映射到特定函数。

用法:

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：映射的数组。

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 map() 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。