对 Jquery 的 Tigger 有点疑问

Question

class Plugin {  constructor(element, options) {    this._setup(element, options);    var pluginName = getPluginName(this);    this.uuid = GetYoDigits(6, pluginName);    if(!this.$element.attr(`data-${pluginName}`)){ this.$element.attr(`data-${pluginName}`, this.uuid); }    if(!this.$element.data('zfPlugin')){ this.$element.data('zfPlugin', this); }    /**     * Fires when the plugin has initialized.     * @event Plugin#init     */    this.$element.trigger(`init.zf.${pluginName}`);  }  destroy() {    this._destroy();    var pluginName = getPluginName(this);    this.$element.removeAttr(`data-${pluginName}`).removeData('zfPlugin')        /**         * Fires when the plugin has been destroyed.         * @event Plugin#destroyed         */        .trigger(`destroyed.zf.${pluginName}`);    for(var prop in this){      this[prop] = null;//clean up script to prep for garbage collection.    }  }}这段代码里面的this.$element.trigger(`init.zf.${pluginName}`);不是很懂，代码里面没有声明任何 "init.zf.xxx" 这类事件，那这个 trigger 触发的是什么？

Answer 1

这个事件是提供给使用者使用的，不需要在这里声明，比如element.on(”xxx”,function(){})

Answer 2

The constructor should also call an _init() method, and if needed an _events() method, followed by a DOM event indicating that the plugin is done being initialized.

function Plugin(element, options) {

  // ...

  this._init();

  this._events();

  this.$element.trigger('init.zf.plugin');

}

看到官网的这个表述：followed by a DOM event indicating that the plugin is done being initialized，感觉很迷