如何从txt文件中删除一行 [英] How to remove one line from a txt file
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问题描述
我想在 node.js 中操作以下文本文件(test.txt"):
I have the following text file ("test.txt") that I want to manipulate in node.js:
world
food
我想删除第一行,以便 food
成为第一行.我该怎么做?
I want to remove the first line so that food
becomes the first line instead. How can I do that?
推荐答案
var fs = require('fs')
fs.readFile(filename, 'utf8', function(err, data)
{
if (err)
{
// check and handle err
}
// data is the file contents as a single unified string
// .split('\n') splits it at each new-line character and all splits are aggregated into an array (i.e. turns it into an array of lines)
// .slice(1) returns a view into that array starting at the second entry from the front (i.e. the first element, but slice is zero-indexed so the "first" is really the "second")
// .join() takes that array and re-concatenates it into a string
var linesExceptFirst = data.split('\n').slice(1).join('\n');
fs.writeFile(filename, linesExceptFirst);
});
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