"Javascript - ES6 Practical Video Course" explains the ES6 features that are supported by the running environment, while ignoring the unsupported features. With the gradual support of ES6 running environments such as Node.js, babel and browsers, the content of this set of video courses Will also add. The advantage of this kind of teaching is that it allows students to directly apply the new ES6 features in development and avoids the confusion caused by learning unsupported features.