Instructions for the fs.readFile method in node.js
- 2020-05-05 10:55:08
- OfStack
method description:
The contents of the file are read asynchronously.
Without the top content encoding, the output is in buffer format, such as < Buffer 32 33 31 32 33 31 32 33 31 32 33 >
syntax:
fs.readFile(filename, [encoding], [callback(err,data)])
Since this method belongs to the fs module, the fs module (var fs= require(" fs "))
needs to be introduced before usereceive parameters:
filename file path
options option object, containing encoding, encoding format, this item is optional.
callback callback, passing 2 parameter exceptions err and file contents data
Example of :
var fs = require('fs');
fs.readFile('content.txt','utf-8', function(err,data){
if(err){
console.log(err);
}else{
console.log(data);
}
})