node-csv

cd entry
npm install csv

import {stringify} from 'csv-stringify/browser/esm'

let content = "1 2 3 4 5"
stringify(content, (err, output) => {
    //output ->csv格式的字符串
    let filePath = parentPath + '/temp.csv';
    console.log(TAG + "stringify filePath::" + filePath)
    let csvStr = '\ufeff' + output
    let openSync = fileio.openSync(filePath, 0o102, 0o666);
    try {
        //使用os文件读写功能生成csv文件
        let bytesWritten = fileio.writeSync(openSync, csvStr);
        this.text1 = "生成值： " + JSON.stringify(csvStr);
    } catch (err) {
        console.log(TAG + 'stringify write error :' + err)
    }
});

import {parse} from 'csv-parse/browser/esm'

parseToCsvString(filePath) {
    fileio.readText(filePath)
        .then((input) => {
            parse(input, {
                relax_column_count: true,
                skip_empty_lines: true
            }, (err, records) => {
                this.text2 = "解析值： " + JSON.stringify(records);
            });
        }).catch((e) => {
        console.log(TAG + 'parse read error :' + e)
    })
}

import {generate} from 'csv-generate/browser/esm'

generateCsArray(){
    generate({
        seed: 1,
        objectMode: true,
        columns: 2,
        length: 2
    }, (err, records) => {
        this.text3 = "生成CSV数据集： " + JSON.stringify(records);
    });
}

import {transform} from 'csv-generate/browser/esm'

transformArry() {
    transform([['1', '2', '3', '4'], ['a', 'b', 'c', 'd']], (record) => {
        record.push(record.shift());
        return record;
    }, (err, output) => {
        this.text4 = "转变CSV数据集： " + JSON.stringify(output);
    });
}

/node-csv #三方库源代码
|---- entry  #框架代码
|   |---- src   
|       |---- main  
|           |---- ets  
|               |---- MainAbility  # demo代码
|                   |---- pages
|                   |---- test