如何在.csv文件的列中插入值?我正在尝试,但是我在文件中看到了数组[],[],[]
const csv = require('csv-parser')
const fs = require('fs')
const json2csv = require('json2csv').parse;
const results = [];
const fileName = 'copyData.csv'
let results=[]
fs.createReadStream('file.csv')
.pipe(csv())
.on('data', (data) => {
Object.entries(data)
.forEach(([key, value]) => {
data['3col']= 'dataString'
results.push(data);
}
})
})
.on('end', () => {
fs.writeFileSync(fileName, results);
});
该列已存在,其名称为“ 3col”
答案 0 :(得分:0)
您需要使用json2csv将对象转换为csv。
fs.writeFileSync(fileName, json2csv(results));
我还添加了一个条件,即仅在“ 3col”列中插入“ dataString”。
if (key === "3col") {
line[key] = 'dataString'
}
最终代码:
const csv = require('csv-parser')
const fs = require('fs')
const json2csv = require('json2csv').parse
const results = [];
const fileName = 'copyData.csv'
fs.createReadStream('file.csv')
.pipe(csv())
.on('data', (line) => {
Object.entries(line)
.forEach(([key, value]) => {
if (key === "3col") {
line[key] = 'dataString'
}
})
results.push(line);
})
.on('end', () => {
fs.writeFileSync(fileName, json2csv(results));
});