1、同步：

 

var fs = require('fs');
console.log('$file starting...');
var content = fs.readFileSync('fileTest.txt','utf-8');
console.log(content);

2、异步：

 

 

var fs = require("fs");
fs.readFile("fileTest.txt",'utf-8',function(err,data){
    if(err){
        console.log("error");
    }else{
        console.log(data);
    }
});
console.log("Read file async end!");