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:
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}}
输出:
参考 : https://api.emberjs.com/ember/4.7/classes/RouterService/methods