data.js (get a json, the console comes out correctly)
Pass it to index.js through exports, and then pass it to the index.jade template. It turns out that the getdata is an empty object. As a result, title is also an empty object. If getdata.title is displayed, undefined is displayed. Converting json to a string is also an empty string. What is the reason? Is it caused by asynchronous io?
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Give me an idea
promise或者 callback (回调函数)exports=json, exports is now a reference to the json object, no longer a reference to module.exports, so json is not linked to module.exports, so you can either module.exports=json, then require or exports. json=json and then get the value of the attribute json of the object required by this module
You can encapsulate data.js into a module, and then execute the render method as a callback; or use promise to execute the render method in the then logic. Your current writing method cannot obtain the asynchronous value. Secondly, the way you export json is wrong, module.exports=json.