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I want to import the jquery package, but the browser reports an error. What is the reason?**Uncaught ReferenceError: $ is not defined
at a.js:1
(anonymous) @ a.js:1**
温故而知新，可以为师矣。 博客：www.ouyangke.com
a.js depends on jquery. You need to introduce jquery first and then a.js. Take a look at the page to see if it is in this order.Additional explanationI tried it on chrome and it worked.
$ is not defined, which means it has not been introduced successfully. Pay attention to the js reference order, jQuery should be placed first
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
a.js depends on jquery. You need to introduce jquery first and then a.js. Take a look at the page to see if it is in this order.
Additional explanationI tried it on chrome and it worked.
$ is not defined, which means it has not been introduced successfully. Pay attention to the js reference order, jQuery should be placed first