如何从txt文件中删除一行

  • Z时代
  • 2024-01-10
  • 分类：问答

我有以下要在node.js中操作的文本文件（“ test.txt”）：

world
food

我想删除第一行，以使其food成为第一行。我怎样才能做到这一点？

回答：

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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