本文整理汇总了TypeScript中common/EventEmitter.EventEmitter类的典型用法代码示例。如果您正苦于以下问题：TypeScript EventEmitter类的具体用法？TypeScript EventEmitter怎么用？TypeScript EventEmitter使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了EventEmitter类的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: describe
describe('EventEmitter', () => {
let eventEmitter: EventEmitter;
beforeEach(() => {
eventEmitter = new EventEmitter();
});
describe('emit', () => {
it('should emit events to listeners', () => {
let count1 = 0;
let count2 = 0;
const listener1 = () => count1++;
const listener2 = () => count2++;
eventEmitter.on('test', listener1);
eventEmitter.on('test', listener2);
eventEmitter.emit('test');
assert.equal(count1, 1);
assert.equal(count2, 1);
eventEmitter.emit('test');
assert.equal(count1, 2);
assert.equal(count2, 2);
});
it('should manage multiple listener types', () => {
let count1 = 0;
let count2 = 0;
const listener1 = () => count1++;
const listener2 = () => count2++;
eventEmitter.on('test', listener1);
eventEmitter.on('foo', listener2);
eventEmitter.emit('test');
assert.equal(count1, 1);
assert.equal(count2, 0);
eventEmitter.emit('foo');
assert.equal(count1, 1);
assert.equal(count2, 1);
});
});
describe('listeners', () => {
it('should return listeners for the type requested', () => {
assert.equal(eventEmitter.listeners('test').length, 0);
const listener = () => {};
eventEmitter.on('test', listener);
assert.deepEqual(eventEmitter.listeners('test'), [listener]);
});
});
describe('off', () => {
it('should remove the specific listener', () => {
const listener1 = () => {};
const listener2 = () => {};
eventEmitter.on('foo', listener1);
eventEmitter.on('foo', listener2);
assert.equal(eventEmitter.listeners('foo').length, 2);
eventEmitter.off('foo', listener1);
assert.deepEqual(eventEmitter.listeners('foo'), [listener2]);
});
});
describe('removeAllListeners', () => {
it('should clear all listeners', () => {
eventEmitter.on('foo', () => {});
assert.equal(eventEmitter.listeners('foo').length, 1);
eventEmitter.removeAllListeners('foo');
assert.equal(eventEmitter.listeners('foo').length, 0);
});
});
});示例2: it
it('should remove the specific listener', () => {
const listener1 = () => {};
const listener2 = () => {};
eventEmitter.on('foo', listener1);
eventEmitter.on('foo', listener2);
assert.equal(eventEmitter.listeners('foo').length, 2);
eventEmitter.off('foo', listener1);
assert.deepEqual(eventEmitter.listeners('foo'), [listener2]);
});