vue3在单个组件中实现类似mixin的事件调用

class MyDispatch {
    constructor() {
      this._dispatch_list = []
    }
  
    register_on(id, command_type, func) { // 注册事件
      const dispatch_obj = { id, command_type, func: func }
      this._dispatch_list.push(dispatch_obj)
    }
  
    register_off(id) { // 移除事件
      this._dispatch_list = this._dispatch_list.filter(item => item.id !== id)
    }
  
    dispatch(command_type, data) { // 触发并执行事件，根据command_type区分类型
      for (let i = 0; i < this._dispatch_list.length; i++) {
        const dispatch_obj = this._dispatch_list[i]
        if (command_type === dispatch_obj.command_type) {
          dispatch_obj.func(data)
        }
      }
    }
}
// 混入的代码
function testA(emits) {
    const data = '执行成功咯！'
    emits.dispatch('do', data)
}
// 组件代码
function mainTest() {
    const emits = new MyDispatch()
    emits.register_on('testB', 'do', testB)
    testA(emits)

	function testB(data) {
    	console.log('testB 执行，', data)
	}
}

mainTest()

function testA() {
    const data = '执行成功咯！'
    const testB = this.testB
    if (testB) {
        testB(data)
    }
}

function mainTest() {
    const thisArg = {
        testB: testB
    }
    testA.call(thisArg)

    function testB(data) {
        console.log('testB 执行，', data)
    }
}

mainTest()