vue滿足後訂閱也能監聽釋出的模式

1. Event.js

var Event = (function() {
    var clientList = {};
    var triList = {};
    var listen;
    var trigger;
    var remove;
    listen = function(key, fn) {
        if (!clientList[key]) {
            clientList[key] = [];
        }
        clientList[key].push(fn);
        if (triList[key] && triList[key].length) {
            fn.apply(this, triList[key]);
        }
    };
    trigger = function() {
        var arg = arguments;
        var key = Array.prototype.shift.call(arg);
        var fns = clientList[key];
        triList[key] = Array.prototype.slice.call(arg);
        if (!fns || fns.length === 0) {
            return false;
        }
        for (var i = 0; i < fns.length; i++) {
            fns[i].apply(this, arguments);
        }
    };
    remove = function(key, fn) {
        var fns = clientList[key];
        if (!fns) {
            return false;
        }
        if (!fn) {
            fns && (fns.length = 0);
        } else {
            for (var l = fns.length - 1; l >= 0; l--) {
                var _fn = fns[l];
                if (_fn === fn) {
                    fns.splice(l, 1);
                }
            }
        }
    };

    return {
        listen,
        trigger,
        remove
    };
}());

export { Event };


           

2.使用

import { Event } from '@/utils/Event';
export default {
  created() {
  	Event.trigger('getUserInfo', {name: '張三'}, true, 100);
    Event.listen('getUserInfo', this.getUserInfo);
  },
  destroyed() {
    Event.remove('getUserInfo', this.getUserInfo);
  },
  methods: {
	getUserInfo(res) {
		// 釋出出來的資訊會傳遞到這裡
		console.log(res);
		// 列印： {name: "張三"}
    }
  }
};
           

當然也能直接這樣用，(但是這種方式的使用會導緻改監聽，建議使用第一種)

Event.listen('getUserInfo', res=>{
	console.log(res);
});
           

同時也支援多參數的傳遞：

Event.trigger('getUserInfo', { name: '張三' }, true, 100);
Event.listen('getUserInfo', (res, boo, num) => {
      console.log(res);
      console.log(boo);
      console.log(num);
    });

// 多參數依舊能傳遞到這裡
getUserInfo(res, boo, num) {
	  console.log(res);
      console.log(boo);
      console.log(num);
    }