84669 person learning
152542 person learning
20005 person learning
5487 person learning
7821 person learning
359900 person learning
3350 person learning
180660 person learning
48569 person learning
18603 person learning
40936 person learning
1549 person learning
1183 person learning
32909 person learning
Why can variables be identified without adding var? -PHP Chinese website Q&A-Why can variables be identified without adding var? -PHP Chinese website Q&A
Please watch and learn.
在javascript入门篇提到过，变量可以不声明，直接使用，但是不规范，需要先声明，后使用。
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Why can variables be identified without adding var? -PHP Chinese website Q&A-Why can variables be identified without adding var? -PHP Chinese website Q&A
Please watch and learn.
在javascript入门篇提到过，变量可以不声明，直接使用，但是不规范，需要先声明，后使用。