Javascript - 箭頭在事件處理程序中起作用嗎？我是ES6的新手，并且無法完成這項工作：$(this) 單擊時返回undefined？dom.videoLinks.click((e) => {             e.preventDefault();             console.log($(this));             var self = $(this),                 url = self.attr(configuration.attribute);             eventHandlers.showVideo(url);             // Deactivate any active video thumbs             dom.videoLinks.filter('.video-selected').removeClass('video-selected');             // Activate selected video thumb             self.addClass('video-selected');         });但是，如果我改變它所以不是像這樣的箭頭函數，它按預期工作？：dom.videoLinks.click(function(e) {             e.preventDefault();             console.log(this);             console.log($(this));             var self = e.this,                 url = self.attr(configuration.attribute);             eventHandlers.showVideo(url);             // Deactivate any active video thumbs             dom.videoLinks.filter('.video-selected').removeClass('video-selected');             // Activate selected video thumb             self.addClass('video-selected');         });那么如果我在回調中使用箭頭函數，我該怎么做呢？