如何在javascript中导入papaparse？

问题描述

我在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，出现此错误：

(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

如何解决此问题，以便可以读取CSV文件？抱歉，我是Java语言的新手，我对此感到困惑。谢谢！

解决方法

嗯，我想你应该像那样用木瓜蛋白酶

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.'); 
    }
});

我找到了有关papaparse How can I read a local file with Papa Parse?

的帖子

javascript papaparse