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fs.writeFile(filename, data[, options], callback)
如果文件存在，写入的内容会覆盖旧文件内容
参数使用说明如下：
path - 文件路径。
data - 要写入文件的数据，可以是 String(字符串) 或 Buffer(流) 对象。
options - 该参数是一个对象，包含 {encoding, mode, flag}。默认编码为 utf8, 模式为 0666 ，flag
为 'w'
callback - 回调函数，回调函数只包含错误信息参数(err)，在写入失败时返回。
var fs = require('fs'); console.log('准备写入文件'); fs.writeFile('input.txt',
'我是新写入的内容', function (err) { if (err) console.error(err);
console.log('数据写入的数据'); console.log('-------------------'); });
console.log('读取写入的数据'); fs.readFile('input.txt', function (err, data) { if
(err) console.error(err); console.log('异步读取文件数据：' + data.toString()); })
