读写

读

异步读文件

'use strict';
var fs = require('fs');
fs.readFile('sample.txt', 'utf-8', function (err, data) {
    if (err) {
        console.log(err);
    } else {
        console.log(data);
    }
});

// Buffer -> String
var text = data.toString('utf-8');
console.log(text);

同步读文件

'use strict';
var fs = require('fs');
var data = fs.readFileSync('sample.txt', 'utf-8');
console.log(data);

try...catch捕获错误

写

异步写文件

'use strict';
var fs = require('fs');
var data = 'Hello, Node.js';
fs.writeFile('output.txt', data, function (err) {
    if (err) {
        console.log(err);
    } else {
        console.log('ok.');
    }
});

同步读文件

'use strict';
var fs = require('fs');
var data = 'Hello, Node.js';
fs.writeFileSync('output.txt', data);