Instructions for using the fs.readFile method in node.js_node.js

Method description:

Read file contents asynchronously.

If the top content is not encoded, it will be output in buffer format, such as:

Grammar:

Copy code The code is as follows:

fs.readFile(filename, [encoding], [callback(err,data)])

Since this method belongs to the fs module, the fs module needs to be introduced before use (var fs= require(“fs”) )

Receive parameters:

filename file path

options option object, including encoding, encoding format, this item is optional.

callback Callback, passing 2 parameters: exception err and file content data

Example:

Copy code The code is as follows:

var fs = require('fs');
fs.readFile('content.txt','utf-8', function(err,data){
if(err){
console.log(err);
}else{
console.log(data);
}
})