```
C:\Users\Administrator\Desktop\practice\src\index.ts
```typescript
import * as $ from 'jquery';
import Task from './tasks';
import TaskFactory from './task-factory';
let tasks: Task[] = [];
$('#btn-add').click(function (e) {
e.preventDefault();
const task = TaskFactory.getTask(Number($('#task-priority').val()), "Test 1232");
tasks.push(task);
let domString = '';
tasks.forEach(t => domString += t);
$('#task-list').html(domString);
});
```
C:\Users\Administrator\Desktop\practice\src\task-factory.ts
```typescript
import { default as Task, HighPriorityTask } from './tasks';
export default class TaskFactory {
static getTask(priority: number, title: string): Task {
if (priority === 1) {
return new HighPriorityTask(priority, title);
} else {
return new Task(priority, title);
}
}
}
```
C:\Users\Administrator\Desktop\practice\src\tasks.ts
```typescript
import DOMElement from './dom-element';
export default class Task {
private priority: number;
private title: string;
constructor(priority: number, title: string) {
this.priority = priority;
this.title = title;
}
@DOMElement('li')
toString(): string {
return `Priority: ${this.priority}, Title: ${this.title}`;
}
}
export class HighPriorityTask extends Task {
@DOMElement('strong')
toString(): string {
return super.toString();
}
}
```
C:\Users\Administrator\Desktop\practice\src\dom-element.ts
```typescript
export default function DOMElement(value: string): any {
return function (target: any, propertyKey: string, descriptor: PropertyDescriptor) {
const oldMethod = target[propertyKey];
descriptor.value = function (...args: any[]) {
return `<${value}>${oldMethod.apply(this, args)}`;
}
return descriptor;
}
}
```
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