【angular2】@angular/cdk/keycodes 学习02

1. cdk 文档 https://material.angular.io/cdk/categories

2. keycodes 模块提供

import {
    hasModifierKey
} from "@angular/cdk/keycodes";

（1）判断是否有 "修饰按键" 按下(type ModifierKey = 'altKey' | 'shiftKey' | 'ctrlKey' | 'metaKey';)

it('should check whether the alt key is pressed', () => {
    const event = createKeyboardEvent('keydown', 0);
    const altEvent = createKeyboardEvent('keydown', 0, '',  {alt: true});

    expect(hasModifierKey(event)).toBe(false);
    expect(hasModifierKey(altEvent)).toBe(true);
  });

（2）https://github.com/angular/components/blob/master/src/cdk/keycodes/keycodes.ts

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