Ember.js RouterService decrementProperty() 方法

Ember.js 是一款用于开发大型客户端 Web 应用的开源 JavaScript 框架，基于模型-视图-控制器（MVC）架构。Ember.js 是最广泛使用的前端应用框架之一。它旨在加快开发速度和提高生产力。目前，许多网站都在使用它，包括 Square、Discourse、Groupon、Linked In、Live Nation、Twitch 和 Chipotle。

decrementProperty() 方法用于将属性的值设置为当前值减去指定的数量。

语法：

decrementProperty(key,decrement)

参数：

key（键）： 要减少的属性名称。
decrement（减量）： 要减少的数量。

返回值： 新的减少后的值。

安装和运行Ember.js的步骤：

步骤1： 运行以下示例，您需要一个Ember项目。首先，您需要安装ember-cli。在终端中编写以下代码：

npm install ember-cli

步骤2： 现在，您可以通过输入以下的代码来创建项目：

ember new <project-name> --lang en

启动服务器的方法：

ember serve

示例1： 输入以下代码生成此示例的路线：

ember generate route students

app/route/students.js

import Route from '@ember/routing/route'; 
import EmberObject from '@ember/object'; 
  
const Student = EmberObject.extend({ 
    init() { 
        console.log(`Name is ${this.get('name')}`); 
    } 
}); 
  
export default class StudentsRoute extends Route { 
    student; 
    createStudent() { 
        let student = Student.create({ 
            name: 'Alix Mainston', 
            gender: 'F', 
            class: 9, 
            grade: 'B', 
            marks: 98, 
            pocket_money: 9643, 
        }); 
        return student; 
    } 
    getGrade(student) { 
        return student.get('grade'); 
    } 
    setGender(student) { 
        return student.set('gender', 'F'); 
    } 
    decreaseMarks(student) { 
        student.decrementProperty('marks'); 
    } 
    increasePocketMoney(student) { 
        student.incrementProperty('pocket_money', 1000); 
    } 
    model() { 
        this.student = this.createStudent(); 
        this.student.grade = this.getGrade(this.student); 
        this.student.gender = this.setGender(this.student); 
        this.decreaseMarks(this.student); 
        this.increasePocketMoney(this.student); 
        return this.student; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('student', this.student); 
    } 
}

app/template/students.hbs

{{page-title "Students"}} 
<h1>Details:</h1> 
<div>Name: {{this.student.name}}</div> 
<div>Gender: {{this.student.gender}}</div> 
<div>Class: {{this.class}}</div> 
<div>Grade: {{this.student.grade}}</div> 
<div>Marks: {{this.student.marks}}</div> 
<div>Pocket Money: {{this.student.pocket_money}}</div> 
{{outlet}}

输出:

Ember.js RouterService decrementProperty() 方法

示例2： 输入以下代码以生成此示例的路线：

ember generate route details

app/route/details.js

import Route from '@ember/routing/route'; 
import EmberObject from '@ember/object'; 
import StudentsRoute from './students'; 
  
const Person = EmberObject.extend({ 
    init() { 
        console.log('Init Function called....'); 
    }, 
}); 
  
export default class DetailsRoute extends Route { 
    person; 
    createPerson() { 
        let person = Person.create({ 
            name: 'Anubhav', 
            mobile: '1298119967', 
            age: 20, 
            salary: 10000, 
            city: 'Patna', 
            country: 'India', 
            gender: 'M', 
            zipCode: '800020', 
        }); 
        return person; 
    } 
    changeName(person) { 
        return person.set('name', 'Aayush'); 
    } 
    getGender(person) { 
        return person.get('gender'); 
    } 
    increaseSalary(person) { 
        person.incrementProperty('salary', 10000); 
    } 
    decreaseAge(person) { 
        person.decrementProperty('age'); 
    } 
    model() { 
        this.person = this.createPerson(); 
        this.person.name = this.changeName(this.person); 
        this.person.gender = this.getGender(this.person); 
        this.increaseSalary(this.person); 
        this.decreaseAge(this.person); 
        console.log(this.person); 
        return this.person; 
    } 
    setupController(controller, model) { 
        super.setupController(controller, model); 
        controller.set('person', this.person); 
    } 
}

app/template/details.hbs

{{page-title "Details"}} 
<h1>Person</h1> 
<div>Name: {{this.person.name}}</div> 
<div>Age: {{this.person.age}}</div> 
<div>Salary: {{this.person.salary}}</div> 
<div>Gender: {{this.person.gender}}</div> 
<div>Zip Code: {{this.person.zipCode}}</div> 
<div>Mobile: {{this.person.mobile}}</div> 
{{outlet}}