node文件读写

var fs = require("fs");


var readme = fs.readFileSync("readMe.txt", "utf-8");  //同步读取
var writeme = fs.writeFileSync("writeMe.txt", "写入！");    //同步写入
console.log(readme);



var readme = fs.readFile("readMe.txt", "utf-8", function (err, data) {  //异步读取

    fs.writeFile("writeMe.txt", "写入！", function () {    //异步写入
        console.log("writeme has finished")

    })
})

console.log("finish")