如何在javascript中导入papaparse？

Question

我在我的createa文件夹中使用npm install papaparse安装了papaparse。但是，当我尝试在index.js中执行import { Papa } from 'papaparse';时，我得到了这个错误：

(node:6680) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
(Use `node --trace-warnings ...` to show where the warning was created)
/Users/y/createa/index.js:2
import { Papa } from 'papaparse';
^^^^^^

SyntaxError: Cannot use import statement outside a module
    at wrapSafe (internal/modules/cjs/loader.js:992:16)
    at Module._compile (internal/modules/cjs/loader.js:1040:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1097:10)
    at Module.load (internal/modules/cjs/loader.js:941:32)
    at Function.Module._load (internal/modules/cjs/loader.js:782:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
    at internal/main/run_main_module.js:17:47

我也尝试过const { Papa } = require("papaparse");

const { Papa } = require("papaparse");

papa = Papa()
papa.parse("x.csv",{
    complete: parsedData => {
        let headerRow = parsedData.data.splice(0, 1)[0];
        let csvData = parsedData.data;
    }
})

这是我得到的错误：

/Users/y/createa/index.js:9
papa = Papa()
       ^

TypeError: Papa is not a function
    at Object.<anonymous> (/Users/y/createa/index.js:9:8)
    at Module._compile (internal/modules/cjs/loader.js:1076:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1097:10)
    at Module.load (internal/modules/cjs/loader.js:941:32)
    at Function.Module._load (internal/modules/cjs/loader.js:782:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
    at internal/main/run_main_module.js:17:47

如何修复此问题才能读取CSV文件？对不起，我是Javascript的新手，我很困惑它是如何工作的。谢谢！

Answer 1

嗯，我想你应该这样，你爸爸

const fs = require('fs');
const papa = require('papaparse');
const file = fs.createReadStream('challenge.csv');
var count = 0; // cache the running count
papa.parse(file, {
    worker: true, // Don't bog down the main thread if its a big file
    step: function(result) {
        // do stuff with result
    },
    complete: function(results, file) {
        console.log('parsing complete read', count, 'records.'); 
    }
});

我找到一篇关于papaparse How can I read a local file with Papa Parse?的文章