1、同步：

var fs = require('fs');console.log('$file starting...');var content = fs.readFileSync('fileTest.txt','utf-8');console.log(content);2、異步：
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!");