Instructions for using the fs.appendFileSync method in node.js_node.js

Method description:

The function of this method is similar to fs.appendFile(). The only difference is that this method uses synchronous operation, while fs.appendFile uses asynchronous operation.

Grammar:

Copy code The code is as follows:

fs.appendFileSync(filename, data, [options])

Since this method belongs to the fs module, the fs module needs to be introduced before use (var fs = require(“fs”) )

Receive parameters:

1. filename {String}

2. data {String | Buffer}

3. options {Object}

encoding {String | Null} default = ‘utf8′

mode {Number} default = 438 (aka 0666 in Octal)

flag {String} default = ‘a’

Source code:

Copy code The code is as follows:

fs.appendFileSync = function(path, data, options) {
if (!options) {
Options = { encoding: 'utf8', mode: 438 /*=0666*/, flag: 'a' };
} else if (util.isString(options)) {
options = { encoding: options, mode: 438, flag: 'a' };
} else if (!util.isObject(options)) {
Throw new TypeError('Bad arguments');
}
if (!options.flag)
Options = util._extend({ flag: 'a' }, options);
fs.writeFileSync(path, data, options);
};