Now the front and back ends of the project are not separated. The page has a form to jump, but the query is very slow. Now I have temporarily added a loading effect, which is displayed when the button is clicked, but the loading will not disappear when clicking return in Apple WeChat. I It is estimated that js will not be executed when returning. How to make this loading disappear before the page jumps? The page is as follows:
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
It can be made into ajax, which is easier to handle. ps: You need to pay attention to the problem of slow query. During development, query is relatively slow, but when it is put into use, it will be okay
Just use layer