Node.js 为什么fast csv没有'；是否将数据存储在NodeJS中？

您好，我只想在节点中存储一列CSV，以操作数组中的数据，我正在尝试读取并存储它，但它不起作用。发生了什么？这是我的密码

let stream = fs.createReadStream("Supliers.csv");

let csvStream = csv({headers: true})
.on("data", function(data){
     /*data.forEach(x => {
      console.log(x)
     })*/

     Final.push(data)
})
.on("end", function(){
     console.log(Final);//[THE COMPLETE DATA TOTALLY OK]
});

stream.pipe(csvStream);

console.log(Final)// []

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我不明白：（HELP

基于您的代码，我添加了注释

let stream = fs.createReadStream("Supliers.csv");

let csvStream = csv({headers: true}).on("data", function(data){
     // This is inside a function that gets slightly later, in the 
     // next tick of the event loop.  I.e. it's called after
     // the 'console.log(Final)' statement.
     Final.push(data)
})
.on("end", function(){
     // You can do your processing in this function
     console.log(Final);
});

stream.pipe(csvStream);

// This gets called before the '.on("data"...' function.
console.log(Final)

// To prove that this works (***but don't use this in your code***)
// the following should work too.
setTimeout(() => console.log(Final), 100);

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我建议您阅读Node.js事件循环：

如何存储数据以在其他函数中使用它？感谢您的回答，这取决于您想对它做什么。您可以将必要的代码放入

.on（“end”…

函数中。这是处理数据的好地方。我将尝试@psiphi75谢谢