Node.js 文件操作

var fs = require("fs");
var nowDate = new Date();
var result = nowDate.toLocaleDateString()+""+ " "+ nowDate.toLocaleTimeString();
fs.appendFile("d:/2/js/hello.txt",result+"\n", err => {
    if (!err) {
        fs.readFile("d:/2/js/hello.txt", "utf8", (err, data) => {
            console.log(data); // Hello world
        });
    }
});