Description of Fs.readfile method used in Node.js _node.js

Method Description:

Read the contents of the file in an asynchronous fashion.

Without the top content encoding, the output will be in Buffer format, such as: <buffer to 33>

Grammar:

Copy Code code as follows:

Fs.readfile (filename, [encoding], [Callback (Err,data)])

Because this method belongs to the FS module, it is necessary to introduce FS module (VAR fs= require ("FS") before use.

Receive parameters:

FileName File path

Options option object, which contains encoding, encoding format, which is optional.

Callback callback, passing 2 parameter exception err and file content data

Example:

Copy Code code as follows:

var fs = require (' FS ');
Fs.readfile (' Content.txt ', ' utf-8 ', function (err,data) {
if (err) {
Console.log (ERR);
}else{
Console.log (data);
}
})