Page debugging, display: properties of undefined(readin 'code'). Use echo.json_encode(['code'=>0,'msg'='Save successfully'])
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The problem is solved. It was because the page encoding was wrong. Change it to utf8 and it will be fine.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
