angular 全局監聽鍵盤事件

• 技術點：使用EventManager
• 根模塊中不要引用，組件模塊中引用
  import { EventManager } from '@angular/platform-browser';
• 組件constructor中實例化對象
  constructor(private eventManager:EventManager){}
• 在ngOnInit中註冊全局監聽

ngOnInit(): void {
    this.eventManager.addGlobalEventListener('window','keyup.esc',()=>{
      alert('你點擊了ESC');
    });
}

上面的代碼是監聽當WEB頁面中按下esc按鍵，則會彈出模態提示框，完整代碼以下

import { Component, OnInit } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { EventManager } from '@angular/platform-browser';
    
    
@Component({
   selector: 'app-root',
   templateUrl: './app.component.html',
   styleUrls: ['./app.component.css']
 })
 export class AppComponent implements OnInit {
   ngOnInit(): void {
     this.eventManager.addGlobalEventListener('window','keyup.esc',()=>{
       alert('你點擊了ESC');
     });
   }
 
   constructor(
     private eventManager:EventManager
   ){}
 }