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前后端数据交互
source link: https://juejin.im/post/5a1d08c4f265da432c2397d3
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前端与后台的互动无非是前端需要后台的数据来生成自己需要的页面，前端做出的框架需要后台的数据来填充，在没学习数据库之前，我们把前台上交的数据经过.txt文件来记录，然后需要用的时候，再读取.txt文件，这个方法并非长久之计，接下来学习的数据库就为我们解决了这个难
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