84669 person learning
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$value -> grade = $value -> grade -> name;Teacher, how is this achieved?
不要计较眼前得失，一件看起来吃亏的事情，往往会变成有利
The source code download is provided in the courseware download column. You can check how the value is defined in the method of the parent class
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
The source code download is provided in the courseware download column. You can check how the value is defined in the method of the parent class