// 添加一个适当的事件监听器
obj.addEventListener("cat", function(e) { process(e.detail) })

// 创建并分发事件
var event = new CustomEvent("cat", {"detail":{"hazcheeseburger":true}})
obj.dispatchEvent(event)

var raw = function (args) {
  var keys = Object.keys(args);
  keys = keys.sort()
  var newArgs = {};
  keys.forEach(function (key) {
    newArgs[key.toLowerCase()] = args[key];
  });

  var string = '';
  for (var k in newArgs) {
    string += '&' + k + '=' + newArgs[k];
  }
  string = string.substr(1);
  return string;
};

var createNonceStr = function () {
  return Math.random().toString(36).substr(2, 15);
};

var createTimestamp = function () {
  return parseInt(new Date().getTime() / 1000) + '';
};

  <el-button v-bind="$attrs" v-on="$listeners">
    <template v-for="(index, name) in $slots" :slot="name">
      <slot :name="name" />
    </template>
  </el-button>

class EventBus {
  constructor() {
    this._events = [];//存储自定义事件
  }

  /**
   * 注册事件和处理函数
   * @param event
   * @param fn
   */
  on(event, fn) {
    if (Array.isArray(event)) {
      for (let i = 0, l = event.length; i < l; i++) {
        this.on(event[i], fn)
      }
    } else {
      // 存在直接push, 不存在创建为空数组再push
      (this._events[event] || (this._events[event] = [])).push(fn)
    }
  }

  /**
   * 注册事件和处理函数，触发一次后销毁
   * @param event
   * @param fn
   */
  once(event, fn) {
    let _self=this;
    function handler() {
      _self.off(event, handler);
      fn.apply(null,arguments);//emit里面调用时会给on方法传参
    }

    handler.fn = fn;//off里面根据这个判断销毁事件
    this.on(event, handler);
  }

  /**
   * 销毁事件和处理函数
   * @param event
   * @param fn
   */
  off(event, fn) {
    //不传参数表示清空所有
    if (!arguments.length) {
      this._events = [];
    }
    //数组循环清空
    if (Array.isArray(event)) {
      for (let i = 0, l = event.length; i < l; i++) {
        this.off(event[i], fn)
      }
    }
    const cbs = this._events[event];
    if (!cbs) {
      return;
    }
    //不传第二参表示清空某事件所有监听函数
    if (arguments.length == 1) {
      this._events[event] = null
    }
    let cb, i = cbs.length
    while (i--) {
      cb = cbs[i]
      if (cb === fn || cb.fn === fn) { //cb.fn===fn用来移除once注册的事件
        cbs.splice(i, 1)
        break
      }
    }
  }

  /**
   * 触发某事件所有回调并带参数
   * @param event
   */
  emit(event) {
    //once删除事件会导致下面循环过程中this._events内fn前移, 所以此处复制成新数组
    let cbs = [...this._events[event]];
    if (cbs) {
      for (let i = 0, l = cbs.length; i < l; i++) {
        try {
          cbs[i].apply(null,[...arguments].slice(1))
        } catch (e) {
          new Error(e, `event handler for "${event}"`)
        }
      }
    }
  }
}
//测试用例
let eb=new EventBus();
eb.once('event1',params=>console.log(11,params));
eb.on('event1',params=>console.log(22,params));
eb.emit('event1',33)

overflow: hidden;

        .clearfix::after {
            content: '';
            clear: both;
            /* 转为块级元素 */
            display: block;
        }